I really like W3Schools. Some people don't like it, and that's ok, too. I especially like the feature that allows me to "Try it!" myself. I can copy and paste their sample code and take it and run with it. The interface is a bit cluttered, tho', I will admit.
When you use the <link> or <script> tags to include external libraries, in order to reduce download time for your users and links in your document that point to the links on the following page. This make the web faster:
It's perhaps a little early to jump into this, but these are short video clips and very helpful too. I'll post more links later. Hope this is of help!
Getting started with google search api using json:
Specific location on Google Developer page for parsing google search results in JSON format:
Good blog post on the DOM:
Good video on DOM basics: