I just skimmed the first section of Learn Enough Command Line and discovered you can hold option to use the mouse to insert the cursor in the middle of a line.
I thought I knew how to use cli but now I feel like I need to go through this whole tutorial to see what other incredibly obvious things I've been missing.
I would say thats a Unix specific thing more than CLI. It will work on Linux web browsers. Unfortunately three button trackpads seem to be disappearing.
Most Linux distributions by default configure the track-pad to emulate the middle mouse by clicking the left and right button simultaneously. Not as nice as an actual third button, but useful if you are on a laptop without a peripheral mouse attached.
I thought I knew how to use cli but now I feel like I need to go through this whole tutorial to see what other incredibly obvious things I've been missing.