Customizing product page on Shopify
To edit product page you first need to check out the Theme settings. It depends on the Theme, but many of them have already built-in product page layouts and the possibility to modify many elements.
If those elements are not enough, you can change product page layout completely and create a custom product page, which means that the elements will be just the way your business requires. Sometimes it can partially be customized by apps from the Shopify App Store, but in the majority of the cases the only way is to edit product page code.