Witr and Nawaafil

Q:

1. Could you please provide a hadith with translation  which proves that Prophet Sallalahu alaihe wasalaam recited durood and duaa in the first Qaidah of sunnat e ghair muakkadah salaah &  Sana in the third rakaah of sunnat e ghair muakkadah salaah as what the Fuqaha mention that the above method  is afdhal?
2. Is there a hadith which proves that Prophet Sallalahu alaihe wasalaam didn't recite durood and duaa in the first Qaidah of sunnat e ghair muakkadah salaah &  Sana in the third rakaah of sunnat e ghair muakkadah salaah?

Q: In a four rakaat sunnah ghayr muakkad salaah or a four rakaat nafila prayed with one taslim, if one reads in the first tashahhud after the durood ibrahimiyyah a masnoon dua does this entail sajdah sahw? Or is this permissible?

Q: Do nafil prayers make up deficient fard prayers? Like one missed a pillar of fard salaah unknowingly, or does missing a pillar unknowingly not get one accounted on that?

Q: Can we read salaatul chaast at the time of ishraaq?

Q: Which is more preferred and rewarding? Sunnah and Nafal Salah at home or at the Masjid?

Q: If someone has not performed asr salaah for some reason and after that he has performed isha (night prayer) and taraweh with jamat? Now what is the ruling of shariat on him if he is performing witr without jamat in this case in month of Ramzaan?

Q: In the second rakaat of Witr, one reads Sura Naas.  What Sura should or can then be recited in the third rakaat?

Q: I have a question that in the nusus of quran and sunnah what is the number of rakats (most authentic) in Taraweeh?

Q: What is the status of performing isha as a jamaat While tarweeh is going on in a small musallah and an obvious disturbance for the imaam of Taraweeh takes place? Will it be correct to prevent the isha jamaat?

Q: Two hafezs are to perform taraweeh. One cannot make sujdah due to injury. knees cannot fold. some say he can perfrom taraweeh, some say no due to him not being able to do a sajdah. I would really appreciate clarity on this matter.