Witr and Nawaafil

Q: Does Salaatut Tasbeeh erase major sins also?

Q:

1. In witr salaah in the month of Ramadhaan, how should a masbooq complete his salaah?

2. Is it wajib for the masbooq to recite dua-e-qunoot when he stands up to complete his salaah?

3. In which rakaat will the masbooq recite dua-e-qunoot?

Q: Can an imam lead Taraweeh Salaah while looking at the Quran on a watch? As you know now there are smart watches. Those smart watches can automatically scroll the mushaf, so you don't even have to move or touch the screen. What's the ruling regarding this?

Q: Is Tahajjud accepted when we did not offer Isha Namaaz?

Q: Can we offer only 4 farz of zuhar? If I do not offer rest of the namaz is it okay?

Q: Could you please tell me if qunoot is recited at the time of calamities?

1. At what type of calamities it should be read.

2. Should it be read in fard prayers (all) or in nafil prayers.

3. How to read the qunoot in Salah (procedure with dua).

4. Is that the same procedure that Nabi Muhammed (sallallahu alaihi wasallam) read for one month for the destruction of enemies who killed pious people, what happened to them as a result.

Q: Salatul ishraq is the start of salat duha? Like if I pray 2 rakat after 20 mins of sunrise, so it will be considered as both, chasht and ishraq prayer?

Q: With regards to Taraaweeh:

1. An Aayah was recited correctly. The Imaam thereafter repeated the Aayah and changed it (incorrectly) due to some doubt. Is the initial correct recitation or the second recitation which was incorrect taken into consideration? Does the Aayah have to be repeated?

2. For the purpose of listening to the Luqmah of a Saami', the Imaam remained silent for the duration of 3 Subhaanallaah or more (he did not recite Qiraat for that duration). Should Sajdat-us-Sahw be made?

3. Additionally, if a person because of some disturbance missed an Aayah in Surah Faatihah, or one sentence in his At-Tahiyyat, does he have to make Sajdatut-us-Sahw? To what extent is the Surah Faatihah and At-Tahiyyat Waajib? 

Q: What is the manner of offering khusoof prayer?

Q: Can a person sit and read taraweeh without a valid excuse, just because he is feeling tired or his back is paining a bit?