Unfortunately there aren't super heroes in real life.
Uhm! Aren't there?
Well, there was Sheldon Brown (July 14, 1944 – February 3, 2008). Brown not only was a bicycle mechanic and technical authority of legendary reputation, he also maintained his knowledge on his website. Many articles can be found, dealing with repairs and maintenance, riding tips for beginners as well as for advanced riders, general information on bikes, lights, bike traveling, and much more. Although the articles are categorized, it sometimes is hard to find information you need at the moment, but it is worthwhile to search the site. As they used to say on the usenet: "AASHTA. As always, Sheldon has the answer."