[enb]

As others have mentioned, make sure you understand the difference between git an github.

The way I built an understanding of git was to create a local git repo, and start working with some plain text files. I tried the various commands - add, commit, branch, merge, and observed what happened to each file. Take this a step further and start working with a remote - you can use github.

This is how I built a mental model of what git and its commands do.