How do taxes work in a business from a Seller point of view in USA? What if the business are like two sided marketplace?

I bought food from a restaurant.
I as a buyer pay taxes.

Does the restaurant pay any taxes from their pocket or they pass through the customer taxes to the government?

1a. When does the business settle taxes to the government? Everyday or Quarterly or annually?
2. Let's if the business is like DoorDash. Here does all three parties like DoorDash, customer and restaurant pays 3 taxes for a single product sold?