Bonify Custom Fields

This is an incredibly flexible plugin for Theme customization. The tutorials are great and once you complete a couple of them I realized how many more possibilities there are in combining different field types together with custom liquid. If you don't know anything about liquid I would suggest learning the basics from Shopify's site before trying this, but you don't need to know much more than that to realize how useful Custom Fields is. I used it to easily integrate .svg icons into my theme without having to hard-code my image sources and also to auto-generate tables of specs for my products within a tab. Custom Fields is a must-have plugin.