Probably you should be asking yourself what, then, should be my first steps towards this mobile technology?
First of all, you must learn it by heart. There are a lots of online resources for beginners, intermediates and experts. The W3 Schools, Treehouse, HTML5 Rocks are all good starting points. But also, if you want to go hardcore, you can delve into the W3C Specification, which is the bare bones real deal, so to speak; and the HTML Language Reference.
There are also hundreds, if not thousands, of books (both paper and digital), and there’s always the classic in-person lessons, that many institutions impart. Most of all, online content, can surely satisfy all your needs, if you have the discipline.
However, the most important thing is keeping up to date with the scene. It’s a very good idea to follow some relevant people and organizations on Twitter, Facebook, or subscribe to their newsletters, when available. To name a few I’ve not already mentioned,Smashing Magazine, The WHATWG community, Chrome Dev Relations, and David Travis.
The key is just to go ahead and start working with HTML5. You do not need expensive tools to begin; you can use any plain text editor, like Emacs, Text Wrangler or Notepad. You may develop and test right in your personal computer, and then deploy to a server, or distribute your files for offline viewing. As cheesy as it sounds, your imagination is the limit; if you have an idea and are not afraid to learn new things, you can create anything you want.