Method of Salaah

Q: I just want to ask when praying where should I place my hands? Is it below or above the navel? I follow Imam Abu Hanifa. Jazakallahu khayr.

Q: In salah if I make a pronounciation mistake in sajda or ruku while reciting the tasbeeh first time or second time and if I correct it in the third time, will the salaah be still valid or the moment I make a mistake in sajda or ruku the salah becomes invalid. If the mistake happens in sajda or ruku, if I correct it the total tasbeeh becomes 4 times and in other sajdas it will only be 3 times. Does this difference effect the validity of salah and how to correct myself when I make mistake in sajda.

Q: Further to your advice that arms should be fully stretched during ruku' in Salat, please advise me further. I am a tall person with long arms, therefore in ruku' my back does not become horizontal without slightly bending my elbows. Am I excused from levelling by back, or it is not a requirement at all?

Q: I just wanna ask about the sunnat-e-muakadah before fardh of zuhr. I should perform it with salaam at the end and now my question is on the third rakaat am I only going to recite fatiha and also in the forth rakaat just like praying fardh or I should recite another surah in the third rakaat and another surah in the last rakaat after faatiha?

Q:

1. I just want to ask in the zuhr and asr salaah when you are behind the Imam are you going to recite the surah fatiha and then after fatiha do I need to recite another surah? Or only the surah fatiha?

2. Another question of mine in magrib and isha salaah on the first and second rakaat after we say ameen behind the imam, do I need to repeat the surah
fatiha silently while the imam is reciting another surah? I follow Abu Hanifa.

Q: Is it permissible to read surah qadr in the first rakat of salah and surah bayyinah in the second. What is the number of aayats that make a surah longer than another one?

Q: I just want to ask when is the perfect time to make du'a? Is it after salaah? I mean after you make tasbeeh or after performing sunnatul muakadah?

Q: In the second rakaat of any Salaah, can a longer Surah be recited compared to the Surah recited in the first rakaat? Or must the Surah recited in the first rakaat always be much longer than that recited in the second rakaat? If so, on what basis should the length of a Surah be determined? 

Q: When performing salaah sitting on the floor, and going into ruku, how far down should one go down?

Q: In a four rakaat sunnah salaah, if a person reads Surah falaq and naas in the first 2 rakaats, is it fine to read surahs before that thereafter, such as Surah wal aadiyaat and qariah?