How to learn the HTML source

I'm now learning HTML source.

 

First I had to understand the basic concept of it.

 

For beginners

 

Maybe this website might help you.

http://www.htmldog.com

To practice

 

This website have a lot of very useful information in terms of HTML source.

http://www.w3schools.com

 

As soon as possible, I hope I can do it well.