If you want to start learning HTML5 then you should really look at what new Tags it has to offer before starting. 

Below is list of common tags for HTML5:

Tag

Description

<article>

Defines an article in the document

<aside>

Defines content aside from the page content

<footer>

Defines a footer for the document or a section

<header>

Defines a header for the document or a section

<nav>

Defines navigation links in the document

<section>

Defines a section in the document