[marcamos]

Source: http://www.sitepoint.com/article/html-37-s...-perfect-markup

The above link has a wonderful article about 37 steps to writing better, if not perfect, markup [(x)html]. Some of the steps are educational to the n00bs, some are plain "duh-I knew that", but there are quite a few that are either obscure and wonderful, or downright new for most of us. Below is a sampling of the 37 steps mentioned:

To prove that everyone can still learn something, I have highlighted those items below that I either had no idea about, or found extremely informative beyond what I already know... and I have been coding for over seven years.

• What is HTML?
  
• What are the different versions of HTML?
  
• What about XHTML?
  
• Is HTML case-sensitive?
  
• What does the DOCTYPE declaration do?
  
• What is a DTD?
  
• What is the difference between Strict, Transitional and Frameset DTDs?
  
• Which DOCTYPE should I use?
  
• Why should I validate my markup?
  
• Why does HTML allow sloppy coding?
  
• Why does the validator complain about my <embed> tag?
  
• What does character encoding (charset) mean?
  
• What is a BOM?
  
• What encoding should I declare?
  
• How do I insert characters outside the encoding range?
  
• Why do I need to write & instead of just &?
  
• How should heading elements be used?
  
• What are block-level and inline elements?
  
• Can I make an inline element block-level with CSS?
  
• Why are external CSS and JavaScript files a good idea?
  
• Should I use p or br?
  
• What does "semantic" mean?
  
• Should I replace b and i with strong and em?
  
• Why are layout tables considered harmful?
  
• Should I use divs instead of layout tables?
  
• Are tables deprecated?
  
• What is the correct use of the address element type?
  
• What is the correct use of the dfn element type?
  
• What is the correct use of the var element type?
  
• Should I use quotation marks within or around a q element?
  
• What is the difference between abbr and acronym?
  
• Why is <feature X> deprecated?
  
• Must I have an alt attribute for every image?
  
• What is the difference between class and id?
  
• Why doesn't id="123" work?
  
• Why doesn't <a href=My Cool Page.html> work?
  
• How can I include an HTML page in another HTML page?