What are the essential skills for 6 to 8 year olds?

There are a few exercises or skills that we teach from 6-8 yrs old, the first is called around the world, kids take the ball, put it on the strings and you have to roll the ball around the edge of your racket without it falling off, you have to complete one lap to have a success. the kids love this exercise it’s the goal to get 3 laps. The challenge is to not let the ball, fall off, the reward for the kids is a ticket, which at the end of the session allows them to win prizes. the kids consider a ticket as a win, so every time they get a ticket their chances increase at Inning prizes. the first skill to master is called around the world. This the first exercise for 6 to 8 year old players.