The laws pertaining to a person in the final stages of his life

Q: Could you explain to me the various masaa'il that pertain to a person in the last stages of his life? I have heard that the one who is in the last stages of his life cannot deal in his wealth freely. Therefore, I wish to find out that if a person in this state gifts something to a relative or a non-relative, will his gifting be valid? From which point will one regard a person to be in the final stages of his life?

Muslim woman marrying a non-Muslim

Q: I am a Muslim Sunni Sayyed woman coming from a religious background. Recently a Christian man has approached me. He says he wants to marry me. I also like him. He is ready for doing nikaah. I am a follower of Islam and don't want to compromise on Islam. Kindly guide me if it is haram to marry a Christian or can I marry him. My religion is a priority for me.