Like a FAQ section? Here's one for JKs: http://www.wranglerforum.com/f33/the...ad-155488.html
. There's a similar one in the other tech sections I believe.
The problem with this proposal is that it's a huge endeavor. I'm sure that if somebody actually took the time to write up a great "Basic Jeep Mechanics" thread for each model of jeep along with pics and diagrams, then it would get stickied. That'd be great. But who's going to do all that? There's so much "basic" information--engine, transmission, t-case, differentials, axles, brakes, wheels, tires, suspension, hard/soft tops, doors, electrical and wiring, offroad features, and on and on and on. We're a voluteer crew here.
Honestly, the easiest thing to do is just ask about things you don't understand, and reflect on the answers you get. For example, think you want a lift? Review the "lift review" thread in the section that applies to your jeep, and then post any follow up questions in the applicable tech section. Same for tires and the like--there are stickied threads on the topic, make sure to review them.
Also, don't forget to try to take advantage of the forum's search feature. Plenty of folks have asked plenty of questions over the years.
Finally, you should know that--fundamentally--your jeep is not very different from any of the millions of other vehicles on the road. The fundamentals of how a gasoline engine works, a transmission, solid axles, brakes, etc. is information that is not unique to jeeps. A few years back, I picked up a copy of "Auto Repair for Dummies." Great book that gave me a lot of insight on how my jeep operates.