My old copy of Bicycling's repair book is pretty much outdated except for working on my old tech bikes. The Park Big Blue Book is very helpful as, I'm sure, are other more up to date repair books. When I take on a new repair task or one I need a little help with, I like to have a book to look at and online instructions and/or videos as well. Whatever it takes to make me see the light. The info is out there and not too hard to find via Google.