HTML5 brought in a lot of nice new features, such as the use of more semantic tags. In other words we can use
footer and much more instead of using
In addition most of these features are geared towards giving the web pages the ability to display media and interactive features more easily. However there are still browser compatibility issues with some of that functionality.
Check out Dive into HTML5, which is a website and book on the cool stuff about HTML5.
In this section you can find a lot of helpful links to other content. This is a supplemental material for you if you want to dive deeper into some concepts.