What does the word "extra" mean in this context? Could you give me some examples?

Rebecca

In this video, the word "extra" is used as an adverb, and it means to a greater extent than usual. "An extra good hair day" means that it will be a "good" hair day that is especially (or extra) good. Ex: My son is very well behaved today. He is trying to be extra good. Ex: The birthday present I bought for my sister is extra special. She has wished for it for a long time.