What is the ruling of Islam on some schools writing Arabic letters on the ground as a means of teaching them to students?

Horrible odors come from the apartment below mine because the neighbors, there, are keeping more than twenty cats. I can`t tolerate this situation any more. What is the ruling of Sharia on this?

What is the difference between obeying one`s parents and honoring them, and should I obey my parents in whatever they order me to do; especially, when they refuse an eligible suitor?

When is it recommended and discouraged to give Salaam, and what`s the ruling on returning it ?

Is it permissible to kiss the hands of parents, scholars and other people of righteousness?

What are the restraints on non-Muslims entering a mosque?

What is the ruling on cleaning car shields and windows with newspapers and throwing them away in addition to other uses that dishonor the Arabic language with which they are written?

Is it a Sunnah to cover the head for the Muslim men during the five daily prayers or while out of house?

Sometimes, my parents are asleep in their bedroom while its door is open. Is it permissible for me to enter their room in order to wake them up, for instance ?