Here is a quick drop in you can add to the product.liquid page to see all possible outputs from the product object. This helped me when figuring out how to manage different states with the user controls and pricing of a product.
I can’t believe how little documentation there is on how to use linklists that are set from sections scheme settings in Shopify. Here is a quick and simple way to access linklists.
Searching for how to implement standard sort_by functionality in Shopify is a mixed bag. The official support for this functionality does not work well in custom themes. Simply dropping in the code they provide does not work.