I thought this was a nicely presented list of Linux commands. The commands are presented in sections and make it easier (for me) to find what I need:
htps://linoxide.com/linux-how-to/linux-commands-brief-outline-examples/
disclaimer: I have not tested every last command with the IPFire build.
EDIT: and with a cheat sheet!
EDIT2: above broken link replaced by this link: