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Instructor: In this module, I wanna introduce you

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to how Git works

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and how you can use it to achieve various powerful wins.

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And I'm gonna be talking about

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and showing you how you can use Git

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on the command line to do things such as version control

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or how to clone repositories,

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how to fork, make pull requests, and merge repositories

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and a whole bunch of really, really exciting things.

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So let's talk about version control in its simplest form.

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Let's say that I create a new code file

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and I write a few lines in it.

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Now I decide to put it under version control using Git

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and let's say that I call this save point number one.

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Now this is my first version, so later on as I progress

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I write maybe a few more lines of code.

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And at this point I decide to make another save point

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and I call this my second version.

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Further down the line, I accidentally screw up

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my entire code file and it's irreparable,

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and I get to the point

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where I would rather burn my entire code file

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rather than having to try and fix it.

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You do get into these situations

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because very often your code is interlinked

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and each class depends on another.

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And sometimes you can screw up

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in a way where you know all hope is lost

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and I simply just want to roll back to the last save point.

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I can do that using Git.

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You can either compare your current code file,

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so the current mess that you've made,

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against a previous version,

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so at any of the save points before.

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Alternatively, you can simply just roll back

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to a previous version,

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and it doesn't have to be the one

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that was immediately previous.

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You can go as far back or as far forwards as you like,

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as long as you know which version you want.

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In the next lesson, I'm gonna show you version control

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using Git locally on your computer,

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and we're gonna use the command line to do this.

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So I'll see you there.