You must first repent to Allah for leaving an obligatory fast without a valid reason, as this is a major sin. Then you have to make up the missed days. But if you had intercourse while breaking a day of Ramadan, this is a different story.

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This is a sunnah. Kindly refer to the following link(s): https://m.youtube.com/watch?v=lGUfHl8HRK8

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The day of Arafat is the 9th of the month, regardless of the country you are in! Therefore, if according to the moon sighting, your ninth is on Monday, this is the day you fast, regardless of the Muslims in Saudi Arabia doing it a day earlier.

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