Sajdah and Jalsah

Q: Should the feet be kept together or apart in sajdah? All this while I used to have it together until I read in the Majlis that there is no basis for it. What should I do?

Q: In sajdah if the two hands are placed on the ground but only a part of the palm and the tips of the fingers are touching the ground does this affect the salaat?

Q: Is it ok if I make English dua or Portuguese dua in sajdah in farz or nafl namaaz? One Aalim from Portugal said I can. After all, he is a learned Aalim, whats wrong if I follow him? All mazhabs are correct after all.

Q: If the toes slide slowly during sajdah (because of the khuffs) without it becoming seperated from the ground, is the sajdah and thus the salaah valid?

Q: What is the Hanafi proof for making the heels touch in sajda? Is this applicable to followers of other madhabs as well?

Q: What is the Sunnah method of going down in sajdah? Should we go down into sajdah without placing the hands on the knees, or go down with placing the hands on the knees?

Q: How long is it waajib for jalsah in salaah?

Q: What are the dua's whilst in sajdah?

Q: If a person is incapable of making du’ā in Arabic during his salāh, may he make du’ā in any other language? I read that if he is able to make du’ā in Arabic, then there exists a difference of opinion in the permissibility of doing so in a different language while in salāh. According to Imām Abū Yūsuf and Imām Muhammad, it is impermissible and the prayer will not be valid.  On the other hand, according to Imām Abū Hanīfah, the prayer will be valid, but it is makrūh (disliked) to do so. Is this true? But the question is what if a person is incapable of making du’ā in Arabic during his salāh? Is it permissible without being makruh?

Q: If a person makes a sajdah on a warm hat which overlaps onto his forehead, will this be correct?