What strategies did Louis XIV use to control the French nobility?

Answer 1

He used his residence at Versailles to compel nobles to come to that small town, in which was a built a large palace.

The nobles had to come to Versailles to be near the king. The king arranged that he handed out all offices,. Louis expected them to be there all the time. If a French noble wanted to secure a place in a government office for a cousin, the king would reply, "Ah! He is a man I do not know." Meaning, the person himself should get to Versailles and start waiting on the king.