Those things which render the Salaah invalid

Q: During Salah, I have the habit of pulling up the sleeves of my pants/jeans, with my hands, before going into the sujood position. Does this action invalidate my Salaah?

Q: Majority of the time when I do sujood, my little toe doesn't touch the ground and perhaps the two besides it, but the big toe and one next to it  mostly do if not all do, so, is all toes touching the ground with pressure waajib/Fard, if so should one make movements in sujood or seating to ensure they touch the ground? Also I am not able to remember all the times this has happened, a lot though.

Q: What should be done if while praying one is not sure if they broke their wudhu due to wind? I often try to hold the wind but I am not sure if
I was able to hold it or if I let it out slowly?

Q: I understand that if one laughs aloud in Salaah, his wudhu breaks, and if he laughs silently, only his Salaah breaks. However, I wish to know what constitutes a loud laugh and what constitutes laughing silently. Also, is a smile considered laughter?

Q: If one clears their throat in salah due to excess phelgm, does wudu break? Heavenly ornaments says one can clear their throat if compelled to do so.

Q: While leading the salaah, I had a feeling that mazi may have been discharged, but was not sure. When I returned home, I found a slight wetness
at the tip of my private area, and it was only when I began to clean it that the mazi began come out. Now I am uncertain if it remained in the passage 
during salaah and began to come out as a result of walking, or if any came out during salaah. Firstly, will it be necessary for the congregation to repeat the salaah? Secondly, is this common, or is it a medical issue?

Q: In Tahajjud salah can we take the Quran and recite from it?

Q: My question is about "taqlid after amaal".

If a Hanafi after salaah, finds out his salaah was not valid according to the Hanafi madhab, but it is valid according to for example Hanbali madhab, can he follow that madhab and suffice with salaah he has prayed?

Q: What is amal-e-katheer?

Q: I was offering namaaz when I heard some sound from my stomach. I am 90% sure it wasn't gas but as I am too much surrounded by waswasas I began to think I may have broken my wudhu but I continued with my namaz. My question is was my namaaz valid?