Method of Salaah

Q: In salaah for Hanafi's, should they recite surah Fatiha while following an Imaam in fardh salaah? 

Q: Is it allowed to recite two surahs which are not in correct order in one rakah?

Q: Can we recite any of Allah's names as a supplication in sujood?

Q:

1. Is it compulsory to recite Tasmiyyah before Surah Fatiha in the 2nd, 3rd & 4th rakaats of Salaah.

2. If we mistakenly recite Surah Naas in the first rakaat of Salaah, how do we continue with the rest of Rakaats? Will Sajda-e-Sahw be compulsory?

3. If I mistakenly recite a Surah in the second rakaat which is earlier in order to what was recited in the first rakaat, should an additional latter Surah be recited if it is realised within the rakaat?

Q: Should we read a dua when the imam reads the last verses of Surah Gashiyah?

Q: If a person forgets to recite surah faatihah or leaves out any other waajib in a sunnat salaah and only remembers after the time has passed, does he need to repeat the salaah or not?

Q: Can we read "rabbana hablana min azwajina.....imama" and "rabana aatina fidduniya hasanah......waqina azab-al-meezan" in namaz after durood and before salam?

Q: What if a person makes a mistake in the first salam of salah (i.e changes ح to خ) and without correcting it moves to the second salam, is the prayer valid?

Q: On Tuesday 25/7/17 a certain female gave a talk after the taaleem. (My cousin asked me this question) She mentioned that reading the relevant tasbeehaat during the different postures of salaah 3 x is actually for musaafir (travellers) and not for those not travelling. We should read upto 11 x tasbeehaat in each posture. We are not ulema so can the ulema please enlighten us...because as far as we know even the imams of the masaajid read 3 x. So have we been taught wrong all the years?

Q: I would like to know the ruling concerning dua after the congregation in the masjid. Should it be done audibly or should it be done inaudibly. Some people take offence at the fact that in certain masjids the day after congregation is made inaudible and they feel that because it is a congregation we should make the dua are similarly for everybody in an audible voice.