Another thing that helped me: Get comfortable in the Terminal. Obviously you have to learn some commands and how they work, but just configure your shell and commonly used CLI tools. It makes the experience so much more pleasant. Install a nice shell prompt, set up some aliases for frequently used commands, learn the basics of shell scripting and write your own useful little scripts for things you often have to do, maybe start using Vim and configure it the way you like it. Also explore other shells. Bash is the default shell, but there are better options like zsh or fish. You can watch this video to get some inspiration: youtube.com/watch?v=KKxhf50FIPI. This is actually pretty close to my shell setup. If you want to start customizing bash, check this out: youtube.com/watch?v=b3W7Ky_aaaY.
To continue learning, maybe subscribe to some Linux-oriented YouTube channels. DistroTube makes great videos about Linux, tiling window managers, how to use various commands, how to configure your shell environment, etc. He also reviews many Linux distros or explains why free software is important. If you search any Linux-related topic on YouTube, chances are that DT already made a great video about it.