“Fluency on the command line is a skill often neglected or considered arcane, but it improves your flexibility and productivity as an engineer in both obvious and subtle ways.”
I’ve found that familiarity with the command line has been a real asset throughout my career. There were many times in my early career where I was pulled in to help triage and fix issues because I was familiar with the terminal. This GitHub repository is an excellent starting point.
“This page is not long, but if you can use and recall all the items here, you know a lot”
You don’t need to be an expert, but spending some time getting yourself comfortable will be time well spent. You don’t need to remember all the commands and all the options, just enough to know what to type into your favourite search engine and you’ll be well on your way.
Source: The Art of the Command Line