Programming

But for using the commandline in general, there are a number of resources out there from books to courses. I'll list some but I can't really vouch for them.

• https://www.codecademy.com/learn/learn-the-command-line - This one seems like a general take on using the command line. I think it's free and it's just the certificate that needs to be paid for if you wish to have it.
• https://ubuntu.com/tutorials/command-line-for-beginners#1-overview - Ubuntu actually has a tutorial on using the command line. Hopefully it's similar enough with Pop!_OS that you don't have to guess around.
• https://exercism.org/tracks/bash/about - This one actually goes over using Bash, the shell/programming language typically found on a Linux system. This one is more like a list of exercises to do so it might be more useful after you've gone through the courses/experience of using the command line.
• The Linux Command Line by William Shotts (https://linuxcommand.org/index.php). He has both a free "Internet Edition" (under Books) of the book and there's the version published by No Starch Press. A quick skim between the two version, both the Internet Edition and the published edition seem about the same so I doubt you'll miss out on anything by using the Internet Edition.

Digging through my early days of playing around in Linux distros, I remember man -K <keyword> (capital K, lowercase k does something different) was helpful to me. man -K basically let you search for a command based on whatever keyword you put in. Although the controls for it when you get multiple results is a bit...obtuse. Make sure you read the bottom line, usually they tell you what different keys will do.