Q: Is wearing a skull cap mandatory whilst praying Salaah?

Q: Is the following correct?

Nabi (sallallahu alaihi wasallam) had two journeys in his life: One was Isra wal Meraj to the heavens and the other Hijrah, Makkah to Madinah. In both journeys - he had a companion.
In Meraj - Jibraeel (alaihis salaam)
In Hijrah - Abu Bakr (radhiyallahu anhu)

In Meraj, there came a stage, when Jibraeel (alaihis salaam) said, "Ya Rasoolallah - from here you are on your own. If I put a step forward I will burn."

Abu Bakr (radhiyallahu anhu) *NEVER* left Rasoolullah (sallallahu alaihi wasallam). Had Abu Bakr (radhiyallahu anhu) been with Nabi (sallallahu alaihi wasallam), he would have said... " Ya Rasoolallah - I am not staying back, I am with you - even if I burn".

As far as I learnt, angels can't go against the command of Allah. Does this show Abu Bakr (radhiyallahu anhu) to be better than Jibraeel (alaihis salaam)? Did Jibraeel (alaihis salaam) leave and abandon Nabi (sallallahu alaihi wasallam)?

Q: I want to read isthikaara for a marriage proposal. How many days should it be read for?

Q: I had offered 2 rakaahs of sunnah after zuhr, but I forgot that I already offered it. So I offered it again, but I mistakenly faced the wrong direction instead of the Qiblah. Should I offer the sunnah again?

Q: I recently got my braces off and there is still some glue from it stuck on my teeth. This is normal because the glue is transparent and may be difficult for the dentist to see. However, my next dentist appointment is next week and this week I will have to do ghusl after my haidh ends.

I can’t get an earlier appointment. When I looked online for solutions to get the glue off, they recommended stuff like baking soda but these things can damage the enamel. Will my ghusl be valid with this glue on my teeth?

Q: Is there any narration which explains that Amir bin Rabiah affected Saeed bin khuraif by the gaze?

Q: How long can one keep the nails in Islam?

Q: Is it permissible to use or nap on silk pillow covers or silk bed sheets for men? What if it was given to me to use for medical purposes? (For which I obviously hold intentions upon).

Q: What does Islam say about someone (a Muslim) offering prayers in a gurdwara, temple or church? Is it allowed? If so, then in what conditions?

Q: Yesterday I was having doubts while I was painting my parents house about the paint brush. Today we had half left and when I searched the internet, i found that the paint brush was made from animal hair and it's non halaal. My family members are painting with it before I told them it's najasat because I just found out a moment ago and not yet told them. I have mixed the paint with the brush. Does my house become naajis and what do we do with the remaining paint? If I touch the house with wet hands, does the najasat transfer? This is very distressing. We have thrown the brush but the paint is still left and on the wall. Now must I throw the remaining paint away?