If there's a bike co-op in your area, you may be able to learn a lot by volunteering there. Some have formal classes in the basics. I found a couple of pros at one near me, who are gradually fixing a lifetime of self-taught bad habits.

Not all non-profit shops have real pros, though. Many are run by autodidact hobbyists with a lifetime of bad habits. There's one near me where I'm the "big wrench," and that's a little scary.