Waqf

Q: Could you please explain the defenition of waqf? What are the rights of the waaqif?

Fulfilling the promises one made to Allah Ta'ala

Q: If a person makes a general promise to Allah like for example Allah I promise that I will pray all 99 names every night. Or I promise to read certain amount of durood every night. Or I promise to study this amount, He says these outloud. Is he sinful for not doing these. Are they permanent or can a person speak to Allah in his duaa and take it back? And what if he forgot a certain promise he might have made, will he be accountable for that?

Facing the wrong direction and Performing Salaah

Q: About 2 months ago when I prayed Dhuhr in school, one girl changed the direction of the prayer and I prayed with her even though iI had severe doubts about if it was the right direction. I then found out that it wasn't the right direction but I didn't repeat the prayer. Should I redo the prayer? And is it as if I didn't pray? I had forgotten about this incident, it recently came to my mind, what should I do?