Hi Bailey17,
The way to vary the serve between sidespin/backspin and sidespin/topspin is int eh bat angle and contact. So for more backspin you need to contact underneath the ball at the bottom and for more topspin it’s about brushing up and aroud the side of the ball on contact. The best way to see it is here in this video- https://tabletennisdailyacademy.com/videos/how-to-make-your-serves-more-deceptive/ We talk about how to vary the spin and make your serves harder to read.
Near the start of the video at around 1 minute Dan is talking about how to vary the spin, later in the video there is a slow motionbreakdown for you to see as well! Hope that helps! Tom
