Here are some great resources for learning how to use WordPress.

The Official WordPress User Manual – https://make.wordpress.org/support/user-manual/
This is a living document created and maintained by the amazing and dedicated wordpress.org team.

Easy WP Guide – http://easywpguide.com/
You wont find any talk of HTML, PHP or creating WP Themes here. What you will find is an easy to follow WordPress manual that will help you understand the basics of editing your site content.

Codex for the WordPress Project – http://codex.wordpress.org/
The online manual for WordPress and a living repository for WordPress information and documentation.

WordPress TV – http://wordpress.tv/
Videos from WordCamps and more all about our favourite CMS and blogging platform.

WP 101 – http://www.wp101.com/
Some free but mostly pay access video tutorials about learning the ins and outs of WordPress.