Tui Shou (Push/Sensing Hands), Da Lu (Big rollback), Da Shou (striking Hands) and San Shou (Free fighting).
Future area of talk about 8 energies, striking, and sparring in Taiji gong fu.
Tui Shou addresses the 4 square directions. There is single hand, and double hand fixed step and moving step methods.
Da Lu addresses the 4 corner directions as a bridge to Da Shou and San Shou.
Da Shou uses striking of ban lan chui, 5 fists drills, and more.
San Shou free fighting with all above.
In all, there are over 100 methods to cover and master.