Qadha and Kaffara

Kaffaarah for having intercourse with one's wife while fasting in the month of Ramadhaan

Q: About 8 years ago, I had sexual intercourse with my wife while fasting in the month of Ramadaan. I didn't know that time if this was a violation or haraam or if there is any kaffara that needs to be paid. Later I have realized that I might've made a mistake or committed a sin. So I would like to ask what shall I do now? Is there any kaffara that needs to be paid r just ask forgiveness from Allah?

Qadha for fasts that were broken due to masturbating

Q:  

1. Prior to 1 year earlier, I did not know that masturbation breaks the fast and I used to do it in the state of fasting. Do I still have to make qada even if I did not know it at that time?

2. If yes, how should I calculate how many fasts I should make qada for? I am not sure how many of my fasts were broken like this. How many qadas should I make if I did not know this for 5-6 years after becoming baligh?

3. Should I make qada for all the fasts for the past 5-6 years or is there a specific number I can keep to make it alright?

4. Am I obligated to keep all the qada fasts together or can I keep them once or twice a week?

Husband forcing wife to break Ramadhaan fast to engage in sexual relations

Q: What do the scholars say regarding A woman who fasts during Ramadhaan. Her husband is not normally home and comes home for a week during Ramadhaan and forces her to break her fast for sexual relations and he himself doesn't fast. What should this woman do for her fast? Ss she committing sin by this act? Please give guidance.