Etiquettes

Q: Is it sunnah to make musafaha when greeting another person? Is musafaha with 1 hand or 2?

Q: I know that interacting with a non-mahram without any reason is not allowed. But I want to ask that when I was a child I used to make salaam to my neighbouring aunties, but now I'm 18 and I feel hesitant doing so. What should I do? Guide me.

س: ما حكم رد جواب الكتاب لم يتضمن سلاما؟

Q: What is the ruling regarding saying "Khuda Haafiz" when departing from a meeting? I know that it is best to say "Assalamu Alaykum", but since "Khuda Haafiz" also has a good meaning, would it at least be better than saying "Goodbye"?

Q: please explain why we greet a single person by saying "Aslamu Alaikum not Alaika or Alaki" violating grammatical rules?

Q: Must one say "As-salāmu ‛alaykum" before entering a room?

Q: Is it obligatory on us to reply if anyone says to us Assalamu Alaikum Wa Rahmatullahi Wa Baraakatuhu? What will be the extent of that reply, do we have to say Wa Alaikum Assalam Wa Rahmatullahi Wa Baraakatuhu or we can just say Wa Alaikum Assalam? Whenever I receives your reply through email, there is always written Salaam in the beginning, do I have to reply to that Salaam as well?

Q: Should we say Aslamu alayk or alaykum to a single person?

Q: What does "was-salaam" mean? Is it Sunnah to end a letter with these words? Is it compulsory for the person who receives a letter which ends with "was-salaam" to audibly reply with wa alaykum salaam?

Q: When I meet my Aunt (father's sister) do I need to bow my head in meeting her or can I just make Salaam from a distance?