Basics of hybriding?

i m just started to make hybrids.
i found an armax from my friend and start to try hybriding.
but i realised that i dont know the basics.i mean what happens if you change the chasis or just replace the engine.
these knowledge requares practicing.But there are people out there already knows the philosophy :)
i have some questions and waiting people to help me (and other newbies)making hybrid.
1)Chasis : efects the car weight ?what about handling .which parts effects most?
2)can i use any drivetrain to make a car 4wd,ff or fr?.are there any difference between subaru or mitsubishi for examole?
3)big wheels?
Please explain basic part functions.and how to make stable cars.
Thanks...
 
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