He has a sickness that makes him unable to remember the number of rak‘ahs and prostrations; should he do the prostration of forgetfulness?

What should a person who joined the prayer late do, if the imam made a mistake and said the tasleem after the third rak‘ah of a four-rak‘ah prayer, then remembered and stood up to do a fourth rak‘ah?

He was not sure about the number of prostrations, and he omitted the prostration of forgetfulness out of ignorance; what is the ruling on his prayer?

Ruling on using an electronic rak‘ah-counter whilst praying

Ruling on the prayer of one who says “Allahu akbar” when rising from bowing

If the worshipper gets up for a fifth rak‘ah in a four-rak‘ah prayer, what should he do?

Is it prescribed not to do the prostration of forgetfulness in Jumu‘ah and Eid prayer?

He started to pray, then he wasn’t sure whether he formed the intention to pray or not; does he have to repeat it?

Ruling on prayer if one omits some obligatory parts out of ignorance or forgetfulness

By mistake he said when bowing, “Subhaana rabbiy al-a‘la”