The same way they taught everyone else. Patience and a lot of practice.
All styles of martial arts do.
Yes there are martial art schools that teach Kendo
No, it is an honorary PhD awarded to martial arts practitioners.
Jackie Chan does not teach.
It depends on the specific martial art. Most of the arts will teach something along the lines of defense against weapons.
You would teach in a martial arts school. The Japanese would call it a dojo.
They are all martial arts from Asia. Kung fu is from China and karate is from Okinawa. Judo, kendo and aikido are Japanese.
Many martial arts have the Axe kick, maybe just known by different names.
There are many, many legends involving the martial arts. One is that the Asian Martial Arts originated with an Indian prince who came to study Buddha, and ended up creating Kung Fu and Zen.
Mixed martial arts is exactly that, a mixture of martial art styles and techniques. MMA practitioners use both Asian arts of all types, with particular focus on Brazilian JuJutsu and boxing.
No, though it is the root of many of the Asian martial arts. Wrestling was the first that is documented.
Actually, kickboxing is a form of Martial Arts. And mostly, kickboxing schools do teach other disciplines. But if the major concentration of school is 100% kickboxing, then Kickboxing only.