Scouting Advice? FTC to FRC help?

[rs201496]

Hi there, I'm currently on a FTC team but recently began interested in watching local FRC competitions. This interests me a lot, but unfortunately I am newer to my robotics team and do not know a lot. A friend of mine explained scouting to me in detail a while back, but he lives farther away so I did not get to far. This is why I have come here for help.

I just have a few questions that I hope could be answered, thanks.

One question I have is are the types of drive trains that are used in FRC?
How can you tell what type drive train a robot is running just by looking at the robot?

Another question I have is about wheels. I just want to know more about the wheels used, and how each is different. (ex, omni, mecanum)

I'm new to the whole robotics scene in general, so please don't be too rough on me for not knowing this stuff Thanks again folks!