Create a free account on GitHub if you don't have one already:

https://github.com/join

Create a repository for this class.

Find a meaningful name for it, please. https://help.github.com/en/articles/create-a-repo

Than install a Desktop GUI for GitHub:

https://desktop.github.com/

(This will also install Git version control system on you computer if it had not been previously installed)

And configure it:

https://help.github.com/en/desktop/getting-started-with-github-desktop/configuring-git-for-github-desktop

Check out the complimentary education pack from GitHub:

https://education.github.com/pack