As to basic maintenance classes, periodically check out the website at bikeirvine.org. My road club - Bicycle Club of Irvine (thus BCIpam) holds free tire changing/basic maintenance clinics every once and awhile. It's free and you don't have to be a member to participate or ride with BCI. If you really want to learn how to take a bike apart, clean it and put it back together the REI class is good. I took it years ago.

Basically I can change tires with no problem, and have learned how to change out a cassette, pedals, seat and seat post and crank. I know how to adjust derailleurs but am not that good at it and allow the experts (ie my friend Richard) to do that. But the biggest lesson learned was how to properly clean a bike. That's real skill. Good brushes are a must as well as good clean rags and a good lube (I recommend Pro Link) and grease. And, have a good friend who likes t work on bikes and let him "help out"!