Personally, I have a GitHub account, and I decided to use it for the code for this book. This is not only a way of being able to quickly share all the code with readers, but also (and quite important!) a way to ensure I wouldn't be able to accidentally lose my work, which I am quite capable of doing! See https://github.com/fkereki/modernjs for all code. I will assume that you have an appropriate Git server, and that you are able to initialize a project, connect it to the server, and so on. Also, VSC needs Git to be pre-installed in your machine; if you haven't installed it, checkout https://git-scm.com/book/en/v2/Getting-Started-Installing-Git to get started.

VSC provides full access to commands through its Command Palette.... as seen in the following screenshot. You can search for a command there, and after clicking on it, VSC will ask for all possible parameters one at the time, so you don't have to do them by memory:

Committing code is quite frequent, so you can directly do it by clicking on the source control icon (third from the top, at the left) and entering the commit message that you want. In that screen, you can also revert local changes and more; mouse over to get all possible features.