Qabli is the SUJUD you make before SALAM when you mistakenly Omit obligatory parts of salat. WHILE Baadi is the SUJUD you make after SALAM when you mistakenly ADD during salat.
During salaat one may make a mistake and ADD something to his or her salaat or Omit something in salaat.
These two mistakes often confuse us on how to compensate for them. I will try to explain the two terms because they are very important to complete our salaat properly.
When you add anything like rakaat, sujuud etc in salaat which makes the salaat more than expected, we term it BAADI. To compensate for BAADI you will add two sujuud after final Tashahhud and Tasleem then sit down to repeat tashahhud and Tasleem to complete your salaat.
When you noticed you’ve shortened or omitted something in your salaat then compensate with QABLI. It is compensated by two sujuud after the final Tashahhud before final Tasleem.
If you are wondering omitting something whiles reciting Tashahhud then just do Qabli and try to increase your Sunnah salaat or Naflat salaat to help fix any unknown mistakes to our fard prayers.
Note:Tashahhud is the ”Attahiiyaat to end” and Tasleem is the final ”Assalaamu Alaikum Warahmatullah we say by turning our head to the right then to the left”
May Allah keep guiding us to His right path and
forgive all our shortcomings … Amin