In the " Product Catalog " menu there is a management of Categories, Products, Properties and Brands. Removing demo content and filling with new categories and products is intuitive, but more details can be found in "Product Filling".
Go to " Settings -> Currencies " and set up the main currency. If you need a secondary currency in which the product will be specified, then you can set the rate at which the price on the site will be automatically recalculated.
Go to " Settings -> Payment methods ", delete the old ones and create your own methods by which the user can pay for the order online. You will need to register in services (LiqPay, Privat24, WayForPay, etc.) to be able to accept money to your wallet. More details in "Payment methods".
Go to " Settings -> Shipping Methods ", here you can delete the old ones and create your own shipping methods. Also, after creation, you will need to mark the payment methods that will be displayed in the basket when choosing this delivery method. Read more in "Delivery Methods".