How the Internet works

Start here

Read Mozilla’s great introduction to how the Internet works.

Also, check out this animated guide to how the internet works.

Internet basics

Ajax requests

Ajax is a way of making a request to get resources with JavaScript, without reloading or refreshing or redirecting the page. Meaning, it can happen in the background, then update a specific part of the page. This is the concept behind web applications, where interaction with a page–clicking or selecting things, etc–doesn’t force your page to reload, but merely updates that particular part of it.

Web frameworks

Registering your domain and understanding DNS