The video is a little bit of a mediocre quality; but the author makes a great and simple tutorial to get you started with Dom4J!
Coding
How to correctly embed a YouTube video in your site
This is a pretty good resource by tipswithpunch. He runs you through the details of embedding a YouTube video in your HTML in the right way. It’s easy, simple – but mainly; it’s important you do it correctly to make it display in a good way on your site for all your visitors; whether they are using a browser or a mobile phone!