Is Marriage without a Wali Valid?

Is it permissible for a woman to stipulate that her husband should not offer naafil prayers and so on, and is he obliged to fulfil that stipulation?

Marriage contract done by phone with no witnesses; husband said that he could get it witnessed after consummation

Is it permissible to marry the daughter of one’s father’s paternal uncle?

What is the ruling if the two witnesses did not hear the woman giving her consent to the marriage?

Marriage without the woman’s wali (guardian), and innovated divorces (talaaq bid‘i)

A Christian woman is worried that her marriage to her Muslim husband may be invalid

The marriage contract is not valid if the man’s sister asks for the hand of the woman for her brother, in the presence of the woman’s guardian

He committed homosexual acts with someone, and now his brother wants to marry the sister of that person. What is the ruling?

She unknowingly married her daughter to a mushrik, and she has three children from him, and she is asking about the ruling