• W3 Schools: The best place to learn any web language for web development.
• CSS examples by tantek.com.
• PHP.net the homepage for the scripting language.
• Stripe Generator: Generate custom background stripe patterns.
• Free CSS Templates: A nice collection of table-less CSS layout desings.

• Pixlr.com/editor: The best online version of Photoshop.
• Markup Language Validator: HTML / XHTML validator.
• CSS Validator: Validate your CSS files.
• Browser Shots: See what your design looks like on other operating systems and in different web browsers.

Corz.org: For great advice and tutorials on how to keep your site secure.

Conditional Comments
When developing a website, you want to make sure your layout / template design works properly on all major web browsers. The best way to do this is to build your layout / template design in your browser that you will be using to view it, then visit Browser Shots to see what your layout / template design looks like on other computer operating systems, and in different internet browsers.

If you find a problem between other browsers that may not be displaying your design correctly, if you are using a windows operating system, you can use conditional comments. Conditional comments are used to pass other instructions to browsers to help / edit the way information / content is being displayed using CSS.

Multiple Developers
If you have more than one person editing files on your website, it's always best to use comments. Using comments helps other developers know whats going on within functions, scripts, arrays, etc. The last thing you want to happen is to have another developer not know whats going on and potentially mess up your website.

Another good practice if your web hosting service provider offers it, is backups. Always make sure you save a backup of your website before you let another web developer work on it. That way if he / she messes up, you can have a quick simple fix.