Adding text fields to products on my Shopify store for getting customization information

You may either use an app to collect customization information for products or edit your theme code to do the same. Here are some good apps that allow the merchant to collect customization requests from the customer - Infinite Options - https://apps.shopify.com/custom-options Product Options and Customizer - https://apps.shopify.com/product-customizer If you prefer editing your theme code over using an app you may find a technical guide here - https://community.shopify.com/c/Shopify-Design/Product-pages-Get-customization-information-for-products/m-p/616525