How crypto future trading works?

If I put huge amount like 10k$ on top 3-7 crypto with 5x leverage. In a stable market , it moves in opposite direction of what I chose, atleast for few hours.

I want to learn, what goes on behind the scenes, how is the upward movement and downward movement caused in case of futures.

When whales open 10M$ long it goes above.(if so he can mint money on anything)(for a long as such to work I think their must be some short to be drained).

When retail investor’s opens some position with margin like 10k$ it goes opposite.