Okay, I'll chime in.
Those Art Margolis books are/were great! When I was in high school, I found an old Margolis paperback at a book sale, and that was what first got me interested in finding/fixing old TVs. I still think Art's books are easily the best I've ever seen in the entry-level "how-to-fix-your-own-TV-set" category. If you're new to fixing old TV sets, you probably couldn't do much better than to find one of those old Art Margolis magazine-style "how-to" TV repair books from the 1960's and thereabouts.