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A Mac is a desktop or laptop computer made by Apple that runs the macOS operating system. You use it for everyday computing (email, web, documents, video calls), creative work such as photo editing, and professional tasks like software development or media production. It sits alongside Apple's other devices — iPhone, iPad, and Apple Watch — but it is the only one in that group designed as a full general-purpose computer with a keyboard, pointer, and file system.

How a Mac fits into Apple's lineup

Apple's products overlap in apps and services, but they are built for different jobs:

The practical difference: a Mac is where you go when a task needs a real keyboard, large screen, multiple windows, and the ability to install desktop software. An iPhone or iPad can do many of the same things, but the Mac is the one built for sustained, heavy work.

What people actually use a Mac for

• Everyday computing — email, web browsing, word processing, spreadsheets, video calls, messaging.
• Creative work — photo editing and cataloging (for example, in Lightroom), graphic design, video editing, music production.
• Professional and technical tasks — software development, data work, running business applications.
• Media and entertainment — streaming, music libraries, and syncing with an iPhone, iPad, or Apple TV.
• Organization and storage — managing files, backups, and photos across Apple devices.

If your work is mostly reading, messaging, and light apps, an iPhone or iPad may be enough. If you need desktop software, large-screen multitasking, or heavy file management, a Mac is the appropriate tool.

Laptop vs. desktop: which kind of Mac

Macs come in two broad shapes, and the choice usually comes down to portability versus screen size and expandability.

Laptops

• MacBook Air — thin and light, aimed at everyday use and travel.
• MacBook Pro — more performance for demanding creative or professional work.

Desktops

• iMac — an all-in-one with the computer built into the display.
• Mac mini — a small desktop you pair with your own monitor, keyboard, and mouse.
• Mac Studio — a compact desktop positioned for higher-end professional workloads.

The general rule: choose a laptop if you need to work in different places; choose a desktop if you want a larger screen, a fixed workspace, or more room to configure the machine.

Where Macs overlap with iPhone, iPad, and Apple Watch

Apple designs these devices to work together. Photos, messages, notes, and calendars can stay in sync across them, and a Mac can serve as the hub where you manage files and backups for the others. That integration is a major reason people choose a Mac rather than a Windows PC — but it also means setup, accounts, and syncing are common points where new users need help.

If you need help getting started or fixing something

A Mac is straightforward once it's set up, but the first steps — initial setup, networking, moving files from an old computer, syncing with an iPhone or iPad, or learning a specific app like Lightroom — are where people most often get stuck.

Metro MacSupport, run by Apple Certified Support Professional Ronald Gehrmann, provides training, tutoring, coaching, troubleshooting, and support for Mac, iPad, iPhone, iPod, Apple TV, and Apple Watch users in Portland, with remote support available anywhere. If you're deciding whether a Mac fits your needs, or you already have one and want help with setup, networking, or a particular application, that's the kind of support to look for: an Apple-certified professional who can work on-site in the Portland area or remotely.

Start with the Get Started with Unity tutorial on Unity Learn, then set up Unity Hub and the Unity Editor before touching any other course. That tutorial is a guided tour of the Editor that ends with you creating your first 3D scene, so it gives you a working environment and a finished result in one sitting. From there, the fastest path is a guided Collection rather than jumping between unrelated tutorials — "Get your first game running" takes you from a blank Unity 6 project to a playable game and covers the editor, C# scripting, physics, and game design fundamentals across 9 resources.

Before you open any tutorial

Unity Learn's beginner Quick Guides assume you have the tooling in place. Do these first, in order:

1. Install Unity Hub — the launcher that manages Editor versions and projects. Unity Learn lists a 10-minute beginner tutorial, "Explore the Unity Hub," for this.
2. Set up the Unity Editor — a 15-minute beginner tutorial covers this. Note that Unity 6.6 is the current release referenced on the site.
3. Create a Unity ID and sign in — Unity Learn's welcome page prompts you to sign in, and course progress and submissions are tied to your account.

If you skip step 2, most tutorials will fail at the first instruction because menu items and project templates won't match what the instructor sees.

The recommended first sequence

Steps 1–3 are short and tooling-focused. Step 4 is where actual game development begins — it's the point where you stop following clicks and start making decisions about your own project.

Choosing a track after the basics

Once you have a playable game, pick a Collection that matches what you want to build. Unity Learn organizes these by goal, not by difficulty:

• Create a 2D game (6 resources) — sprites, physics, Tilemap, skeletal animation, and level design for platformers and roguelikes.
• Create a 3D Game (10 resources) — Rigidbody physics, C# scripting, enemy AI, and Cinemachine cameras for FPS and open-world games.
• Make your game look great (12 resources) — URP, Shader Graph, VFX Graph, real-time lighting, and post-processing.
• Ship your first mobile game (8 resources) — build setup, URP mobile optimization, Addressables, and Unity Gaming Services for iOS and Android.
• Build with Unity AI (10 resources) — the Unity AI Assistant, AI Gateway, and MCP Server inside the Unity 6 Editor, for writing scripts and debugging errors.

Pick one and finish it. Switching between the 2D and 3D tracks mid-way means re-learning a different physics and rendering setup for no benefit.

Pathways vs. Collections vs. courses

Unity Learn uses three formats, and they serve different purposes:

• Quick Guides — single-skill, 10–30 minute tutorials (Hub, Editor setup, publishing, Editor tips and tricks). Use these to unblock a specific tool.
• Collections — resources curated around a single goal, like getting your first game running. Use these when you know what you want to build.
• Pathways — longer guided learning experiences aimed at breaking into the gaming and real-time 3D industries, described as suitable regardless of prior experience. Use these if your goal is employment rather than a single finished project.
• Courses — in-depth topic coverage combining step-by-step tutorials and projects, and many include submissions where you apply what you learned.

Common places beginners get stuck

Starting with a course instead of the Editor setup. Courses assume a configured project. Do the 15-minute setup first.

Treating tutorials as videos to watch. Unity Learn tutorials are step-by-step and expect you to perform each action in the Editor. Reading without doing produces no working scene.

Jumping to "Make your game look great" too early. URP, Shader Graph, and VFX Graph are visual polish. They won't help if your game logic doesn't run yet.

Not finishing a Collection. The value of "Get your first game running" is that it connects editor, scripting, physics, and design into one artifact. Stopping at resource 4 leaves you with disconnected fragments.

What to do after your first complete game

Move to a project-based course in the track you chose, and use the submission feature where available — many courses include submissions so you apply the material rather than just follow it. If your goal is a job in games or real-time 3D, a Pathway is the better next step than another standalone tutorial.

If you're new to Ahrefs and want to run your first SEO audit, the fastest path is: open Site Explorer, enter your target URL, review the Overview for a health snapshot, then dig into Organic Keywords, Top Pages, and Site Audit to find specific problems. From there, build a short prioritized to-do list instead of trying to fix everything at once.

This tutorial walks through that workflow using a realistic starting scenario, explains what the numbers mean, and shows how to turn findings into actions.

Before You Start: Pick a Narrow Scope

A common beginner mistake is auditing an entire large website on day one. The reports become overwhelming, and you can't tell which issues matter.

Instead, choose one of these starting points:

• A single important page (your homepage or a key product/service page)
• A small site (under ~50 pages, e.g., a personal blog or small business site)
• One section of a bigger site (e.g., /blog/)

For this tutorial, assume you're auditing a small business site with about 30 pages. The same steps scale up later.

You'll need an Ahrefs account to follow along. Ahrefs offers paid plans, and pricing and feature limits change over time, so check the current Pricing page for what's included in each tier before committing.

Step 1: Enter Your Target in Site Explorer

Site Explorer is Ahrefs' core tool for analyzing any website or URL.

1. Open Site Explorer from the top navigation.
2. In the search box, paste your domain (e.g., example.com).
3. Choose the Exact URL or Domain mode depending on scope. For a full-site view, use Domain or Prefix; for a single page, use Exact URL.
4. Press Enter.

You'll land on the Overview report. Don't try to absorb everything — focus on four numbers first.

Reading the Overview Snapshot

Important caveat: Ahrefs' traffic and keyword numbers are estimates based on its own data. They won't match Google Search Console or your analytics exactly. Treat them as directional, not absolute.

Step 2: See What You Already Rank For

Go to Organic Keywords in the left sidebar. This shows queries where your site appears in search results.

Sort by Traffic (descending) to see which pages bring the most estimated visitors. Then look for:

• Keywords ranking in positions 4–15 — these are often the easiest wins. A small content or on-page improvement can push them onto page one.
• Keywords with high volume but low position — potential opportunities if the topic is relevant.
• Irrelevant keywords — if you rank for something off-topic, it may signal thin or mismatched content.

Write down 5–10 of the position 4–15 keywords. These become your first optimization targets.

Step 3: Find Your Best and Weakest Pages

Open Top Pages. This ranks your URLs by estimated organic traffic.

Look for two things:

1. Your top performers — understand what topics and formats work. Can you create more content like this?
2. Pages with traffic but poor rankings — these may need on-page fixes (title, headings, internal links).

If a page gets zero traffic and targets a topic you care about, it's a candidate for a rewrite or consolidation.

Step 4: Run a Technical Site Audit

Now move to Site Audit. This crawls your site and flags technical and on-page issues.

1. Click Site Audit → New project.
2. Enter your domain and set crawl settings (default is usually fine for a small site).
3. Start the crawl and wait for it to finish.

Once complete, you'll see a Health Score and a list of issues grouped by category.

Which Issues to Fix First

Not all issues are equal. Prioritize in this order:

Ignore low-impact warnings (like minor meta description length) until the big items are handled.

Step 5: Turn Findings Into a To-Do List

You now have raw data. Convert it into a short, actionable list. Example:

1. Fix 3 broken links found in Site Audit.
2. Rewrite title tags on 5 pages with duplicate titles.
3. Improve 4 pages ranking in positions 6–12 by adding missing subtopics and internal links.
4. Remove or update 2 thin pages with no traffic.

Keep the list to 5–10 items max for your first audit. Finishing a short list beats starting a long one.

Common Beginner Mistakes

• Chasing every red flag. Site Audit flags many minor issues. Fix what affects rankings and users first.
• Trusting estimates as exact numbers. Ahrefs data is modeled, not measured from your analytics.
• Auditing a huge site too early. Start small to learn the interface.
• Ignoring search intent. A page can be technically perfect but still fail if it doesn't match what searchers want.
• Forgetting to re-crawl. After fixes, run Site Audit again to confirm improvements.

Where to Go Next

Once your first audit is done:

• Compare with competitors using Site Explorer's Competing Domains and Content Gap reports.
• Track keyword rankings over time with Rank Tracker.
• Explore backlink opportunities in the Backlinks and Link Intersect reports.
• Set up recurring Site Audit crawls so new issues surface automatically.

Your first audit isn't about perfection — it's about building a repeatable habit: enter a target, read the key reports, pick the highest-impact fixes, and act. Do that once a month and your site's health compounds.

A video is a sequence of still images (frames) displayed rapidly enough that the human eye perceives continuous motion. The threshold is usually around 24 frames per second (fps); below that, motion looks choppy, and above it, smoothness improves with diminishing returns. This definition applies to any medium that stores or streams such a frame sequence — a downloaded MP4, a live stream, or a screen recording. The sections below cover how video works technically, the formats and codecs you'll encounter, how it differs from animation and still images, and the quality factors that determine what you actually see.

How Video Works: Frames, Frame Rate, and Persistence of Vision

Video relies on two things working together:

• Discrete frames — each frame is a complete still image captured or rendered at a specific moment.
• Persistence of vision — the eye and brain briefly retain an image after it disappears, so when frames are shown in quick succession, the gaps between them are filled in and motion appears continuous.

Frame rate is the number of frames shown per second. Common values:

Higher frame rates produce smoother motion but also larger files, since more frames must be stored and transmitted.

Common Video Formats and Codecs

A video file is really two things bundled together: a container (the file format) and one or more codecs (the compression methods used inside it). The container holds the video stream, audio stream, subtitles, and metadata; the codec determines how each stream is compressed.

When each is used:

• MP4 with H.264 is the default choice when you need a file to play almost anywhere — phones, browsers, TVs, editors.
• WebM with VP9 or AV1 is used for web streaming where open, royalty-free codecs matter, and where file size is a priority.
• MKV is common when you want to keep multiple audio tracks or subtitles in one file without re-encoding.
• MOV with ProRes appears in professional editing workflows because it preserves quality for further processing, at the cost of very large files.

The codec matters more than the extension for quality and size. Two .mp4 files can look and behave very differently depending on whether they use H.264 or H.265.

Video vs. Animation vs. Still Images

These three are often confused because they all involve visual frames, but they differ in how the frames are produced and what they represent.

• Still image — a single frame. No motion, no time dimension. Examples: a JPEG photo, a PNG graphic.
• Video — a sequence of frames captured from the real world (or rendered to look real), played back at a set frame rate. The motion corresponds to something that happened in front of a camera or was recorded from a screen.
• Animation — also a sequence of frames, but each frame is created or manipulated rather than captured continuously. The motion is authored frame by frame or generated by software. A cartoon, a motion graphic, or a 3D render is animation.

The practical difference: video records motion that already exists; animation creates the illusion of motion from individually constructed frames. Both can use the same containers and codecs, so a .mp4 can contain either. The distinction is about production method, not file type.

The Video Pipeline: From Capture to Display

Understanding the pipeline helps explain why a video might look wrong at any stage.

1. Capture — a camera sensor samples light at a set resolution and frame rate, producing raw frames.
2. Encoding/compression — raw frames are compressed by a codec (e.g., H.264) to reduce size. This is where quality can be lost if the bitrate is too low.
3. Container packaging — the compressed video stream, audio, and metadata are written into a container like MP4 or WebM.
4. Storage or streaming — the file is saved, uploaded, or sent over a network. Streaming may split it into segments for adaptive delivery.
5. Decoding — the player reads the container, extracts the streams, and decompresses them back into frames.
6. Display — frames are shown on a screen at the intended frame rate. If the display refresh rate doesn't match, you may see judder or tearing.

A failure at any step — a bad capture, aggressive compression, a network stall, or a mismatched refresh rate — shows up as a visible problem for the viewer.

Key Quality Factors: Resolution, Bitrate, and Compression

Three factors determine how good a video looks and how large it is.

• Resolution — the pixel dimensions of each frame (e.g., 1920×1080, 3840×2160). Higher resolution preserves more detail but requires more data per frame.
• Bitrate — how much data is used per second of video, usually measured in Mbps or kbps. Higher bitrate means less compression and better quality, but larger files. The same resolution at a low bitrate will look blocky or blurry.
• Compression — the method used to reduce data. Lossy codecs (H.264, VP9) discard information the eye is less likely to notice; lossless codecs keep everything but produce much larger files. Compression efficiency (how good the video looks at a given bitrate) is the main reason newer codecs like H.265 and AV1 are adopted.

A useful rule: resolution sets the ceiling for detail, but bitrate and compression determine how much of that detail actually survives. A 4K video at a very low bitrate can look worse than a 1080p video at a healthy bitrate.

Quick Reference

• Video = frames + frame rate + persistence of vision.
• Container vs. codec: the container is the box, the codec is how the contents are packed.
• MP4/H.264 for compatibility; WebM/VP9 or AV1 for open web streaming; MKV for multi-track archival; MOV/ProRes for editing.
• Video vs. animation: video captures existing motion; animation constructs frames.
• Quality is governed by resolution, bitrate, and compression together — not by resolution alone.