WordPress

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Learning WordPress

WordPress Themes

WordPress HTML5

WordPress & SEO

Plugins

http://www.hongkiat.com/blog/beginners-guide-to-wordpress-plugin-development/

Beginner’s Guide to Wordpress Plugin Development

The WordPress CMS has changed the face of our Internet and allowed a surge of new ideas to prosper and its open source movement holds a strong presence rooted in software and web development.
http://www.1stwebdesigner.com/wordpress/ultimate-guide-wordpress-hacks-customizations/

The Ultimate Guide to Wordpress Hacks & Customizations

If you are looking to add new design features and functionality to your WordPress blog, odds are there is probably someone who has already done it and shared the code on how to do it. There are a number of great resources you can use to find outstanding hacks, customizations, and tips to make your WordPress blog more unique, user-friendly, and engaging. Over the years I have collected a number of great resources across the web that I thought would be a great idea to organize and share.
WordPress is infinitely extensible. http://wordpress.org/extend/

Extend

http://www.456bereastreet.com/archive/201103/controlling_and_customising_rss_feeds_in_wordpress/ WordPress by default creates a whole lot of automatic feeds for you.

Controlling and customising RSS feeds in WordPress

30 Extremely Helpful WordPress Cheatsheets

http://www.webdesigncore.com/2011/10/18/30-extremely-helpful-wordpress-cheatsheets/ Cheatsheet is a handy way to keep all code snippets and function practical and are extremely helpful for the web developers and designers.