How much can you usually negotiate off a new car?

I'm curious, when it comes to purchasing a new car, how much wiggle room is there typically for negotiation? Is there a standard percentage or dollar amount that buyers can expect to save by haggling with the dealership? Or does it vary greatly depending on factors like the make, model, and current market conditions? I'm interested in understanding the negotiation process and what strategies might be effective in securing the best deal possible.