Question: how to do qabli and baadi?
Answer: Qabli: is the Sujud you make before Salam when you mistakingly Omit Obligatory parts of Salat. Baadi: is the Sujud you make following Salam when you mistakingly Add or increase during salat. However, you should consult a Sheikh or Imam in your local area or Masjid to properly explain further.