Study the following
Groupset Component Hierarchies:
Groupset - Wikipedia, the free encyclopedia
Make sure that you know both "Shimano" and "Sram"
road bike component hierarchies. Also study both "Shimano" and "Sram"
mountain bike hierarchies.
Groupset = Gruppo
PS.
Also, make sure that when you detach each component part on your bicycle "project", that you fully understand the function of each part. Study that part and how that part may change on different models, along with how that physical change may alter the function of the bicycle.
Also learn about gears and gear ratios. Learn how to use gear ratios for mph calculations, given cadence. Many mechanics don't know much about the following:
http://www.livestrong.com/article/42...rocket-ratios/
http://livestrong.com/article/110397...e-gear-ratios/
* Also, become an expert on at least one particular mechanical aspect of a bicycle. Many new changes are taking place with respect to brakes ie...Disc brakes, V-brakes, Caliper, etc...
Perhaps, even become that "Brake Guy!" 