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.
If you’re going to print something, just buy a book. It’s much cheaper and you don’t have to deal with the carcinogenic effects from the printing.
Online guides are often poorly written.