Where can I learn more about Schema.org markup and the Open Graph Protocol for products?

You can read the following links for more information on the use of Schema.org:

• https://schema.org/Product
  
• https://developers.google.com/structured-data/rich-snippets/products
• https://yandex.ru/support/webmaster/supported-schemas/goods-prices.xml

For more information on using Open Graph:

• https://developers.facebook.com/docs/reference/opengraph/object-type/product/