Mike, I didn't get the impression that he was excluding the Wiki, just looking for additional sources, which, of course, is a good reason to use the Wiki.

I read "besides" as meaning "in addition to."
I found that when I got started just sitting there with some frequency charts and tuning around was a good way to learn. I remember trying to learn the amateur bands from the book, but when I started tuning around, things started to fall in place. A resource like RadioReference would have been very valuable, but such stuff didn't exist then.
Same thing for SWL or Utilities, tuning around the frequency ranges helped me learn where things were.
It's like anything else, playing with it helps you learn. Have fun!
Lee, K3GI