Those things which render the Salaah invalid

Q: If the toes do slide slowly during sajdah (because the prayer rug is slippery) without it lifting off the ground, is the sajdah and thus also the Salaah valid?

Q: I have these doubts all the time. I know too much movement breaks salaah. I have a habit of curling my toes of both my feet, sometimes not ob purpose, sometimes consciously. I am not moving them so much. Just slightly. Will this break the salaah?

Q: Licking lips in salaah out of dryness, will it break the Salaah?

Q: While performing salaah, I felt a small particle of food in my mouth and I removed it with my finger. Is my salaah valid?

Q: To pray Salaah without making intention, to eat during Salah, to lift your feet during Salah, to lift your hands and to make an expression which makes a person looking think that you are not in Salah all make your Salah invalid. If I have done any of these actions whilst not knowing that these break Salah, do I have to do Qadha for them?

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.