"Anybody's Bike Book" I think tha author's name is Cultherson or somthing like that. That's an old book, from the 1060's so you might have a hard time finding a copy but I think that it would be worth the effort. It's a real basic ABC's of bike mechanics with easy to understand line drawing illustrations. That's how I learned.

"Zinn and the Art of Road Bike Maintenance" and "Zinn and the Art of Mountain Bike Maintenance" are two much newer books that capture much (but not all) of "Anybody's" charm. They should be much easier to find.

Once you have a vision of the basics, I think the on line tutorials are quite helpful for most things. If you still find yourself stumped, asking a specific question here will usually result in some real good answers. There are some very good bike mechanics on this site. I suspect that some have grown tires of answering the same basic question over and over but will respond to a specific question if you find yourself stuck.