Kindly refer to the following link(s):
Sujood As Sahu (Prostrations of Forgetfulness) (website)
How to make sujood as Sahu? & What to do if imam makes sujood as sahu according to hanafi Madhab?
Difference between doing Sujood as Sahu before & after Salam
Made 2 or more mistakes in prayer, require sujood as sahu before & after salam, must I do both
The prostration of forgetfulness (sujood as sahu) - Assim Al Hakeem
Missed a Pillar in Salah, like Sujood or Ruku, what to do? | Sheikh Assim Al Hakeem
Missed a rakah unintentionally (pillars: Ruku, Sujood, Fateha...) what should I do?
What to do if you forget which rakah you are in | Sheikh Assim Al Hakeem
Doubtful if I prayed 3 or 4 rakahs. Finished 3, made salam & prayed 1 more rakah, is it valid?
When to do sujood as sahu behind the imam?
What to do if one forgets to make Sujood As Sahu (Prostration of Forgetfulness)?
Made a mistake in prostration of forgetfulness / Sujood as sahu, what to do?