what does a sway bar do?
http://auto.howstuffworks.com/car-suspension3.htm

what does NA stand for(i think i know it means all engine but whats NA)?
naturally aspirated. no turbo. no supercharger. no nitrous. only what the engine itself can bring in.

what does camber do or camber kits?
http://en.wikipedia.org/wiki/Camber_angle a camber kit allows you to adjust this angle back to spec to reduce tire wear

what does i/h/e mean?
intake, header, exhaust

why do people add washers to raise their hood near the windshield?
because they think it helps cool the engine bay. it doesnt.

why do people have tow hooks if their car is so low..that i fthey use them it will be scraping like crazy..probably without even having the wheels touching the ground?
cause it's jdm :shake:

is it true that if u have a b18c swap in an eg its hard to have a/c in your car?
no

what is a lsd tranny compared to hydro? what makes it better?
an lsd is a limited slip differential. a hydro tranny is simply the way the clutch fork is actuated by hydraulic pressure. an lsd keeps both wheels spinning in a straight line and sends power to the wheel with the most grip when going around a turn.

what is dyno tuning? and can it be done and be helpful on a stock engine?like a gsr?
http://www.phearable.net/tech/efibeginnerguide.html

if there's anything you dont understand go to www.howstuffworks.com and search. lots of good info.