This visual explanation will help you understand the concepts behind webhooks and how they differ from APIS.
This visualized tutorial explains the way that APIs work with a farm analogy.
This visual tutorial explains how CSS determines specificity between multiple selectors.
This visual tutorial will teach you how to use localhost, and also show what happens when you put your code on a live web server.
This visual explanation will show how to use AJAX, GET and POST in your front-end.