What to look for in second hand motorbikes (125cc Honda cbf 125 to be more specific)?

Basically i have just done my cbt and i'm looking for a used 125cc motorbike. I have no knowledge on motorbikes so when it comes to buying one from sellers i have no idea what to look for, and i will be pretty annoyed if i buy a faulty bike. My question is what should i look for when buying a bike from someone. I don't know anyone who knows about bikes bring along. I was looking for a Honda cbf 125 no older than three years old. Thank you.

Added (1). i saw a 2012 cbf 125 for £1700 from a dealership but with 16000 miles, is this a good deal?

Difficulty starting, poor idle, oil leaks, evidence of crash or drop.

All electrical functions, high beam, signals, brake, horn.

Tires, tread and sidewall cracking, brake rotors ( scoring ) , pads, excessive wear.

signs of tinkering, do it yourself repairs, rust or oxidization.

Motorcycles like cars can have many unseen problems, so either buy from a good friend or a dealer who will give you some kind of guarantee.