Here is a collection of links that you may find useful as you continue learning about WordPress.
Advanced web design resources: "For people who make websites."
A List Apart Magazine explores the design, development, and meaning of web content, with a special focus on web standards, accessibility, and best practices.
The WordPress bible, from the creators of WordPress.
The codex contains all of the support documentation for WordPress. It is the technical document explaining how every aspect of WordPress works. The site is maintained by the developers of WordPress and supplemented with information posted by users and website designers. If you are using WordPress, you should be sure to review the codex.
Justin Tadlock is the author or the Hybrid Framework for WordPress. He has also authored several plug-ins and contributes his substantial coding experience and ability in popular WP support forums. He has been using WordPress since 2005. See his Tutorials section to learn about how to use PHP in WordPress.
Lorelle VanFossen is a blog evangelist. Her site is geared towards a beginning to intermediate audience. She provides blogging tips, teaches you how to use WordPress, and writes plugin reviews.
Justin Tadlock is the author or the Hybrid Framework for WordPress. He has also authored several plug-ins and contributes his substantial coding experience and ability in popular WP support forums. He has been using WordPress since 2005. See his Tutorials section to learn about how to use PHP in WordPress.
"Helping you learn more about blogging and WordPress every day with help, tips, advice, and techniques for blogging and using WordPress and WordPress.com."
http://www.perishablepress.com
WordPress, design and security by Jeff Starr, with contributing authors.
"Perishable Press provides high-quality, in-depth articles on web design and development, graphic design, social media, blogging, software, and more. Learn how to use WordPress, PHP, SQL, HTAccess, JavaScript, (X)HTML, and CSS to create beautiful sites that are usable, accessible, and secure."
http://www.smashingmagazine.com/tag/wordpress
Learn about WordPress, themes, coding, design, and more. If you are starting out as a WordPress or website developer, Smashing Magazine is an invaluable resource.
"Founded in September 2006, Smashing Magazine delivers useful and innovative information to Web designers and developers. Our aim is to inform our readers about the latest trends and techniques in Web development."
Archive of WordPress podcasts. If you like to learn by listening, be sure to check out WP-Community.org.
Site to help beginners learn about WordPress, by Syed Balkhi.
"WPBeginner is a site for New Wordpress Users. We will have tips, tools, and other advices for all Wordpress users. This can also be a place for new Wordpress users to interact in the comments and help each other out if necessary."
WordPress themes, plugins, tutorials and tips, by Michael Castilla, Dan Philibin and others.
"WPCandy was created on October 1st, 2007, as a blog on everything about WordPress, from the latest themes and plugins to tutorials and tips. Already on it's 3rd redesign, WPCandy is one of the top sites about WordPress and is still kickin' ass."
Also see: WPCoder.com and WPInspiration.com.
WordPress themes, plug-ins, and hacks, by Kyle Eslick.
"WP Hacks was originally created on October 1, 2007 as Hack WordPress, as a place to discuss all things WordPress. In addition to featuring a large variety of WordPress themes and providing reviews of WordPress plug-ins, Hack WordPress was set up to cover the world surrounding WordPress, including the latest WordPress hacks, news, tips, tricks, and how-to's of the popular open source blogging software."
Tips on optimizing WordPress, search engine rankings, analytics and website performance.
Joost de Valk is an SEO consultant and web developer who lives in the Netherlands.
"Tweaking websites is what we do here at Yoast, from search engine rankings, to speed to user experience."