High Toss serving problem

Hi sir Alois, I have a problome on this serve too that's the ball always high and make them easier to flick or topspin so, when i throw the ball and i swing my bat when the bat on what height ? Is it higher than the net or lower ?

Oh i see, anyway, i hurt it's not allowed to hit the ball when it fall lower than the net is it true ?

Heard*

I see anyway, i just practicing my high toss serve it seems my high toss serve is better that the ball is always low by doing as what in the "how to make a low ball" video but, my problome is only the spin on the ball you said that with the high toss, what we need to do is our hand must be relax and spin the ball and it seems the ball is not spin too much, so, how fast the movement of the hand and wrist ? And also most of the serve is long, so how to make the ball short and have a lot of spin with the high toss and also, i try to do he zhi wen high wide fast high toss serve and the bass is not wide and most of the ball will land on the corner of rhe table rather than wide near the net and also, sometimes i throw the ball up, the ball will go in front of my body. So what's the position of my hand to make the ball vertical ? Please for the answer :D anyway, thank you for all of the video thank you very much ^^