Supporting details can do all of the enlisted options except introduce the main idea. Supporting details are there to support the main idea, so of course they cannot introduce it. They are the result of the main idea, not its creator.
The main reason why Odysseus orders music and dancing is make it seem like a wedding celebration is happening, but he also wants to reward his men.
It’s important to know it in general but especially if your an athlete. It’s important to know about this so you can make sure you have enough energy for whatever sport your doing