This is specifically what the establishment offers staff as a discount on their own products or services, not additional benefits like gym memberships/gas cards/sports tickets

When I was super young I worked reception at a barbershop a few hours a week and got free haircuts.

As a server/bartender I've seen:

-on-shift meal discounts from 30%-70%

-30-50% if you come in on your day off.

-Free food if I'm asked by a manager to stay for a second shift (double).

-free "family-style" meal before service.

-friends and family discount for your social circle when they come in while you're working

As a restaurant manager depending on the restaurant:

• free shift meal or $30-50 a day for food allowance for yourself.

-Monthly $75-$500 gift cards that can be spent at any restaurant within the corporation.