You have completed the crash course. At this point you should be a barely capable shell user. There’s a whole huge list of tricks and key sequences you don’t know yet, and I’m going to give you a few final places to go research more.
Unix Bash References
The shell you’ve been using is called Bash. It’s not the greatest shell but it’s everywhere and has a lot of features so it’s a good start. Here’s a short list of links about Bash you should go read: