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How to serve a ping pong ball with a topspin 
Serve a ball with no spin. 
This ball will not travel as fast, but if you are just learning how to play ping pong, it is important you can do this first. 
Hit the ball near its equator, which is the line just through the exact center of the ball.
Make sure you hit it with your racket at a 90 degree angle to the ball. The ball will travel forwards and have little to no spin.