First stop for learning WordPress is https://learn.wordpress.com/
If you prefer video tutorials check out WordPress.tv
Of course wordpress is a social network, and many bloggers have collated their picks of the best resources for learning WordPress, here’s a top three to get you started:
- Best Resources to Learn WordPress Development & Design
- WP Beginners Guide
- The Best Place to Learn WordPress Online
If you find any good resources – p[lease mention them in the comments.