Witr and Nawaafil

Q: Is it permissible to perform two rakaats nafl salaah as sukr to Allah for all His bounties?

Q: I would like to enquire whether reading 20 rakaats of taraweeh is sunnah... I have recently heard someone say that Nabi صلا الله عليه وسلم read 8 rakaats in the musjid and 12 rakaats at home. Is this true?

Also, this person has said that the number of rakaats of taraweeh was not fixed and at one time in Makkah 30 rakaats were read. Could Mufti Saheb please clarify and include some ahaadith that I could use as proof.

Q:

1. What is the method of performing Salaat-ut-Tasbeeh?

2. What is the virtue of Salaat-ut-Tasbeeh

Q: Can a muqeem read his sunnat muakkadah salaah in a vehicle, on the highway?

Q: I want to know about tahajjud salaah, how can we perform tahajjud? 

Q: I have a friend who is around 15 and 16 years old and is a Hafiz of the Quran. He is willing to lead taraweeh this year but he is not sure if he is baaligh. What should he do?

Q:

1. What is the difference between ishraaq, chaasht and awaabeen salaah? Some people say that they are all one nafil salaah, but the names and times are different. Why are these separately described in the ahaadeeth?

2. If someone read ishraaq, does he need to read chaasht as well?

Q:

1. If Asr salaah is prayed in a makrooh time, can the four rakaat sunnah be prayed before the fardh?

2. The makrooh time, I understand starts 20 minutes before Maghrib. Is it right?

Q: Is sleeping after tahajjud permissible?

Q: I heard that one should not pray two times witr in one night. I forgot whether I prayed witr or not after isha. What to do?