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All right.

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So let's start with the obvious question.

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What exactly is GitHub or what does it do?

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There's many answers to that question because GitHub over the years has really evolved and added on

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a bunch of features.

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But the core mechanic, the single thing that GitHub is known for, is that it's a hosting platform

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for Git repositories.

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GitHub allows us to put our Git Repos in the cloud.

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We can access them from anywhere, we can share them with people and we can collaborate with people

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on Git Repos.

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So GitHub has a bunch of features built that have to do with collaboration and discussion about Git

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Repos.

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So I showed this slide very early on, but I just want to return to it.

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There is an important huge difference between git and GitHub.

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Git, hopefully you're familiar with by now is a version control system that we run on our machines

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locally.

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We don't need the Internet, we don't need an account.

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You could go your entire life working with Git and never using GitHub.

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GitHub, on the other hand, is a website.

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It's a hosting platform for Git repositories.

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You need the Internet to access it.

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You need an account.

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It is completely I don't want to say completely separate from Git because it is a hosting service for

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git repos, but git itself is completely independent.

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So imagine I'm working on a video game, a mobile game that I'm developing on my machine and I'm using

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it to track it.

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I have a couple of commits, let's say there's a couple of hundred.

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Those three you're seeing on my machine are just to fit in the diagram and I can make a GitHub account,

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make a GitHub repository and push my local code that repo from my machine up to GitHub.

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And I could do this for a couple of reasons.

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One, I just want to back things up.

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So I keep doing my work and I can push those changes up to GitHub.

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So now GitHub has a record of my repository, so maybe there's a house fire, a horrible tragedy.

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I get a new laptop, I lost my old laptop with the repo on it.

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Well, fortunately for me, assuming I kept my GitHub up to date, I can go to GitHub and get that code

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and pull it down to my machine.

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So that's kind of a I won't say rare, but not as common scenario.

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What really is great about pushing my code up to GitHub is that I can collaborate, so maybe I decide

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I need to bring in, I don't know, another engineer over here on the left and I don't know what her

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name is, let's say Zelda.

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And then I bring in a graphics artist, pixel artist over here on the right.

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His name is Link, so I need their help.

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So using GitHub, they can all clone or they can all get access to this repository on their machine,

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and then they can make contributions, put them up on GitHub, and then we can pull them down and get

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those latest contributions, those new commits.

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And this allows us to collaborate.

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And maybe eventually if my game's a hit, we're talking about dozens or hundreds of collaborators.

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So this is really where GitHub shines.

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It's important to know that GitHub is not the only option for some of these features, specifically

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for hosting repositories.

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There are other options like GitLab, Bitbucket, but the truth is that in recent years, GitHub is

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just completely obliterated.

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The competition.

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It's now become the world's largest host of source code.

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In early 2020, they reported having having over 40 million users.

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These days it looks like over 56 million in 2021 just from their own marketing page, which we'll come

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back to.

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It's really a lovely marketing page.

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And the last slide here on GitHub that's very important is that it's free for our purposes.

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So unlike a lot of subscription platforms or websites where the free tier is just garbage or it's just

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supposed to like lure you into paying more, right?

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Where maybe you have a very limited set of features and if you pay ten bucks a month, then you can

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actually use this in a useful way that is not GitHub model.

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GitHub offers paid tiers, but they're largely oriented towards enterprise, towards companies, for

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individuals, for developers, the free tier gives you pretty much everything you would need unless

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you are creating some incredibly popular tool and open source project that's like used by millions of

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people.

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And all likelihood you'll never need to subscribe to GitHub so I can show you the different pricing

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tiers here.

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Right?

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Here's free.

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There is a team, there's enterprise level, but with this free level, we have unlimited public and

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private repositories, unlimited collaborators.

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There's these things called GitHub actions we'll talk more about.

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So there are some distinctions there.

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You pay for more actions or more minutes a month, and then there are some security features.

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Larger enterprise companies might want single sign on this advanced auditing, but we really don't need

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to worry about that.

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We're focused on just the core mechanics of GitHub.

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It's all here for us, which we are very, very thankful for.

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Somewhat rare in the world of subscription.

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So I'll end off by just scrolling through their beautiful marketing page.

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I really love the illustrations they have.

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You can see some stats about how many people are using it.

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72%.

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A Fortune 50 companies.

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It's really grown both in market share for just open source development and random developers like me,

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but also in large companies.

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So tons of big companies use it.

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I'd say it all boils down to this Give your code a home in the cloud.

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But there are many other features.

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It almost acts as a social network for git repos where you can chat, write comments, approve, disapprove,

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suggest changes to projects, merge code in reject code, call attention to certain lines of code.

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Then there are some other things that don't necessarily have to do with git repos but are kind of adjacent

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like these interactive developer environments I think what do they call it?

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Code spaces.

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That's new.

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GitHub actions will come back to later on.

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Additional features like automatically scanning your repositories and looking for common vulnerabilities

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and letting you know ahead of time and a whole bunch of other things.

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So let's end with that.

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What a beautiful illustration.

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So that's it.

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GitHub does a lot, but for us, what we care about is the fact that it will host our repositories and

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help facilitate collaboration.