It allows you to:
Create products
Set prices
Accept payments
Grant access after purchase
Sales is connected to:
Contacts
Payments
Sites
Memberships (if used)
Where to Find Sales
Open the left menu
Click Sales
When to Use Sales
You only need Sales if you:
Sell products or services
Accept payments online
Offer paid access or bookings
If you are not selling yet, you can ignore this section for now.