Tutorial Unit briefly describes all the mechanics in this part of the game. The player starts off with $100, and can use this money to buy whatever they want from the Catalog.
This day acts as an introduction for the player, teaching them the mechanics of the game, similar to Night 1 in FNaF 3 and Sister Location. Monday is the first day of Freddy Fazbear's Pizzeria Simulator, when the player opens up their restaurant.