Regular Sunnahs vary in number and emphasis. Daytime nafl is two or four per salam; for night prayer Abu Hanifa permits up to eight while the companions prefer two.
Recitation is required in every nafl and Witr rakah, unlike the distinctive treatment of the final two fard rakahs. Broken nafl requires makeup in Hanafi law, with disagreement on how much when the latter pair of four rakahs is invalidated.
The chapter also defines permissibility of seated nafl and riding outside city limits.