When I read namaz I read a surat after surat fatiah all the time, for example, surat nas, surat faalaq.

Should I be reading a surat every time during naamaz for example during Sunnah, Farz, Nafl, Witr etc...................I want to clarufy when to read the surats and should i do it in EVERY rakhat.

Pls clarify :)