Every brush can be turned on a Relax brush if shift is pressed as you paint.
The Move and the Mask brushes use the “bySurface” option to decide how it will grab the vertices, if it’s on, it measures the distance by surface instead use global distance, it’s useful when 2 objects are too close to each other and you want move it independently.
The Clone Brush clones surface details and volume from 2 different shapes, you can either select a shape from the shape browser or save a morph target as reference before start to paint.
The Erase brush will erase any deformation the layer is creating.
Holding Control and painting you inverse the direction of the deformation for every brush but the move and mask.
Holding Control while moving will move the vertices by the average normal.
Holding Control while masking will erase the mask influence.