The Au is a common move that can be used in all capoeira games. There are different variations.
For this tutorial, we will focus on the Au Sem Mao or no hands cartwheel.
The steps start from a basic Ginga position with your left leg back, but can be switched to right leg depending on your preference.
Land on the other side with your right leg and finish with your left leg in Ginga position (can also finish on Cadeira).