An interesting approach would be try to code something with only the official documentation and source code of the libraries your are using. No internet except for the git clone.

I like doing that as an exercise. It trains you well for a very common situation for professional developers. You have to work on a project, poorly documented, the original developers left long ago and no one really knows how it works, except maybe for one guy who don't have time to answer your questions. Of course it is internal stuff, so the internet is no help. It is a valuable skill, literally, companies are ready to pay good money to people who can do that.