The Ken (sword) is the main body of the kendama. It has three cups and a spike to catch the tama (ball). Similar to many skill toys, every human on this planet has their very own kendama style. Some have spent more time than others developing their style but the same rules apply no matter where you are on earth because the only rule you need to follow is physics.
When we were mere infants, our first job was to become experimental physicians. A child will ceaselessly make objects fall, spin, roll, bounce, and sometimes spill. Cause and effect dominant our existence for the rest of our lives. It is important to not overlook the development of the fine motor skills that allow use to manipulate objects because a persons entire adult life is spent making objects fall, spin, roll, and bounce etc.
It is known that similar toys have been made in the 16th and 17th century but some day we may discover even deeper origins. Today, kendama is popular in many parts of the world. Kendama is particularly well loved in Japan, where national tournaments are held and Japanese employers recognize applicants who have attained the higher dan rankings as "persistent, patient and determined potential employees". A citation is obviously needed but lets get to the good stuff. Below is a video that can explain the basic. Take time to learn the fundamentals. They are the building blocks for all future tricks that will come. Having awareness the possibilities will help understand what goals are attainable. Keep pushing the goals and the possibilities become endless fun.