Learn how to use grep and man

You can learn a lot when you actually read through the man pages, and usually there's a pretty standard structure so grep works well if you know roughly what you're trying to do.

Also following issue trackers and mailing lists can be helpful.

Edit: Also try out fish or nu. fish auto complete is amazing and embeds man info into the tab complete options (including flags and such). xonsh is kinda cool too if you are comfortable with Python, and less comfortable with bash.

Just a warning, don't use these as your login shell, just run them from your distro's shell when you want to switch over.