[TallGuyShort]

The ARRL Operating Manual is excellent. It's appropriate for a complete newcomer to just pick up and start reading, but will go into more advanced topics, like antenna design and satellites.

If you're not licensed, there are flashcard apps for your phone that will prepare to completely ace the test very quickly. The manual's a good reference for any questions you don't understand. I'd also recommend finding a local club or other operator just to get a demo of a basic radio contact and the protocol people follow for conversation. Some of it's mandated by governments, but a lot of it just convention.