Safest to start out on the street- a 60cc to 250cc scooter with an automatic transmission. Learn to steer and brake on the street, before adding the clutch and shift lever.
Medium safety- a 250cc Ninja, before 2008 they are uglier and cheaper.
Very little safety- a 600cc 4-cylinder supersport.
You are totally insane- a 1000cc supersport, ZX-14, Hayabusa.
“We need randomness, mess, adventures, uncertainty, self-discovery, near-traumatic episodes, all those things that make life worth living; compared to the structured, fake, and ineffective life of an empty-suit corporate leader with a preset schedule.” From Dr Nassim Nicholas Taleb, Antifragile: Things That Gain from Disorder