There is a new Pickleball rule book for sanctioned tournaments as well as a new 2021 Alternate Rule Book for all other play.
There are many changes and clarifications in the new books.
The most obvious changes are:
- A let Serve is not a let anymore. The ball is in play.
- A drop Serve is allowed where you can bounce the ball before you hit it. There are no rules for this Serve about upward swing or paddle below wrist.
- The old Serve is still the same except belly button is replaced by waist.
- A double hit is more clearly defined and a carry is defined and not allowed anymore.
If you get a chance I would suggest you review the 2021 rules.