about usage User Registration Login Register the sellers product in the profile ->Products menu Register stock in the profile->Stock -> plus (+) buttonNote: It is important to record the stock of the added product. Because it will not be possible to make a sale. Thats because of the business rules I understood, not simply making a sale without having the stock registered, because at some point this was creating problems in the necessary calculations. So thats why I ended up leaving it like this (register stock first for the product to be available for sale) to avoid bugs 5. Make a sale by clicking the + button on the first page 6. View the performance page 6.1. clicking on the sales value to see the sales by category 6.2. clicking on the operating expenses value takes you to the expenses record7. See the stock of what has already left