It’s been a long time since I learned, so I don’t remember exactly what I used, but at a cursory glance, this one looks good:
https://www.terminaltutor.com/
Also, learning to read man pages will help a lot. Here’s an article on that:
https://itsfoss.com/linux-man-page-guide/
I do remember using “terminal cheat sheets” like this:
https://phoenixnap.com/kb/wp-content/uploads/2023/11/linux-commands-cheat-sheet-pdf.pdf
Telling people how much the Trump Tax costs them is now considered “hostility”. Got it.