Website design resources for beginner and intermediate
users
Web Design Group Web Authoring FAQ: a complete, updated and really helpful web authoring FAQ. This FAQ is the mature result of dozens of expert contributors and years of experience in the area of web authoring. This FAQ page should be your first website to visit whenever you have a web authoring question.
HTML Dog Excellent HTML and CSS Tutorials, References, Articles
CSS: Getting Started A brand new complete tutorial in 14 parts at Mozilla Developement Center
4 excellent CSS tutorials from Web Design Group 
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WDG markup validator with several other HTML validation service (batch mode, direct entry, etc)
CSS validator translations available in 8 other languages
Multi-validation Site valet http://valet.webthing.com/ for intermediate and advanced users
HTML Validator (based on OpenSP, just like W3C validator) and HTML Tidy for Firefox http://users.skynet.be/mgueury/mozilla/ 
by Marc Gueury. A true HTML (SGML) validator along with W3C HTML Tidy (linter)! Ideal for offline usage. No upload to do. No extra application to load and run. Just wonderful!
Latest version is 0.7.9.5 and latest (SGML) beta is 0.8.4.6
news:comp.infosystems.www.authoring.html: A discussion newsgroup where you can submit your questions if/when you do not know how to fix validation errors or if/when you do not understand the validator error messages.
