How to quickly add products to the site? I have an online store created on Shopify and I want to add new products to the site faster and have advanced settings.

Are you using any additional software to manage your online store? If not, then I can recommend you this application https://apps.shopify.com/product-fees . This will help you get more options when adding products to your website and help you quickly configure the product groups you need and change the price automatically for different regions or different customers. I know that this application is used by many e-commerce owners on Shopify, you can find reviews about this on the Internet. It seems to me that this meets your requirements, also read on the website of the developer company about the additional functions of this application, it seems to me that you will also find ways to use it more effectively for your online store.