The information links are to various resources used in this topic's projects and lectures.

• W3C Markup Validation Service 
  This website performs validation for your HTML code and for your CSS code. 
  
  
• The Web Developer's SEO Cheat Sheet 3.0
  "The Web Developer's SEO Cheat Sheet is a free and downloadable document that covers all of the important SEO code and best practices that are needed by online marketers and developers."
  
  
• Paint .Net
  This website details a free image and photo editing software for computers that run Windows.
  
  
• From Novice to Expert: The Ultimate list of CSS3 Resources, Tutorials, Tips and More
  This is the ultimate list of CSS3 resources, tutorials and tips from simplilearn.