So do we add files like website files we've been working on to Git so people can see what we're working on?

To add on what Kevin said, the whole point is to track your project's history. That's why it's called a Version Control System. When you're just by yourself, the whole point of using it might not be as apparent, but when working together with other people it's proven to be a very useful tool.

That's because when people work together on a project, they might change things in the same file and so on. If you can track your history, it's easier to see what exactly changed. Git also provides tools to merge those changes together, to make it extra easy.

You don't benefit as much from this when you're working by yourself, but there's one good thing about using git anyway. If you find out you've been doing things the wrong way and you want to start over from a specific point in time, you can tell git to restore your files to look exactly like one of the commits in your project's history. That way you can just throw away all the work you did and start over. This way you don't have to delete all the code you don't want by hand, which could take a lot of time.

On top of that, if you use a service like Github, git is also an easy way to make a backup of your project.

I hope this was somewhat helpful :)