A great way to learn the basics. It’ll be old, but that’s ok. It’s going to cover all the shell basics and then more. It’s still going to be useful, it’ll cost you pennies, you’ll be able to dip into it when you want, and you’ll be giving to a good cause.
I remember spend hours learning Novell networks for the CNE exam. With 18 months of me qualifying, most people had gone to NT . That’s when I quit networking and became a project manager