There have been a lot of threads started here seeking basic info on RC jets. One of the best primers on jets is written by Mike Cherry, the founding editor of R/C Jet International (RCJI) magazine. The softbound book is simply entitled "Mike's Jet Book" and was originally published in 1997 (ISBN 0 9531150 0 3) and distributed by Traplet Publications <www.traplet.com> who also publish RCJI, a must-have subscription also.
In fact, I think Mike's book has recently been updated. My advice? GET THE BOOK! All the basics are covered plus an intro into the more complex stuff.

Mike (not Mike Cherry)

This is a good suggestion. Also, maybe some of the basics that are asked we could put together a "Jet FAQ" and I can post it here in the forum for beginners. I am no jet expert I will admit so if anyone knows their stuff and wants to throw together a faq for us to start with that would be great. We can add to it and edit the faq as a work in progress.

It's actually a good idea that we even do a FAQ in each forum we have here as it would probably be immensely helpful along with books as mentioned above.