XRAY - Model racing cars

hi guys,
just wana find out more about different rebound settings affecting the car...

using same springs, how will a 0%, 50% and 100% rebound settings affect the car's handling?

what's the mostly used rebound settings? for a bumpy track with relatively big jumps and traction is medium-loose.

All of the people "advising me" on my new XT8 are saying to go "medium" on everythign until you get enough feel of the truck to tell the difference between rebound settings.
I, too, sort of wanted to just cut to the chase and set it up like the team drivers right away. But "they" are telling me that I am shorting myself some experience if I don't learn the why first.
I will be very interested to hear what the experts have to say here. Great question, and thanks for asking it.