i wish someone could explain to me this in english, I understand that a short is betting that it will go down, long the opposite, but how does it work in detail? can someone give me an example? like they were explaining it to a 5 year old? lol.

Why does it matter that there are 7300 shorts? because thats a shit ton?
Short: Somebody borrows bitcoins and sells them. Later he will buy bitcoins at lower price and returns them to the lender + interest.
Long: Borrow $$ then buy BTC and sell them later.