Flight is low level telekinesis.
Secondly, it goes
Physical training so they become strong enough and bridge the mind body gap.
Builds a large amount of ki
Mental training to open the mind learn better learn self control.
Also learn to sense ki
Skill training to fully master the movement of the body and techniques.
Also learn how to harness ki for various attacks
Also, flight is low level telekinesis which is powered by ki.
Tien and Piccolo are the most powerful psychics on the planet though.
Also, King Cold and Frieza are mutants of their race(sort of like gohan)
They are only born extraordinarily powerful and have ki to spare so being profficent at ki use is more to do with them being able to use it so freely and play with it and sheer raw power then any real skill.
They also have, at base, greater strength endurance and durability without having to use Ki manipulation.
Goku and Gohan and everyone else had to use ki manipulation techniques to bridge the gap between themselves and their opponents.
It's why the humans are so brilliant.
They are one of if not the weakest races in the entire multiverse. They have to rely on ki manipulation and SCIENCE and some magic to survive. It's why they all have obscene talent at ki manipulation compared to every other race baring like...the fucking namekians and have a boost to ki attack as well.