Make strokes more powerful

Some people say always keep the racket in the same angle and the same stroke always but I see top players doing a topspin from under the table and then they make it so powerful and then they make it short a lot of different types so should I try to do the same or keep the same average speed and spin 

Hi Abdulrahman,

Once you have the basics right then you can adapt to the type of ball and the time that you have available to you.

This will change the swing for each ball that you play but the basics need to stay the same.