In this video I give you an overview of how Shopify apps work and the tools and libraries to aid with the process.

All the docs and tools referenced in the video:

Shopify CLI - https://shopify.dev/apps/tools/cli
Rest API - https://shopify.dev/api/admin-rest
GraphQL API - https://shopify.dev/api/admin-graphql
Shopify Polaris - https://polaris.shopify.com/
Shopify App Bridge - https://shopify.dev/apps/tools/app-br...
Shopify Oauth guide -https://shopify.dev/apps/auth/oauth/g...
Shopify Session token guide - https://shopify.dev/apps/auth/oauth/s...
Shopify theme app extensions - https://shopify.dev/apps/online-store...
Ngrok - https://ngrok.com/