WEB STYLE GUIDES - By Patrick Lynch and Sarah Horton

May or may not follow these set of web style guidelines (recommended by Dr. Vinod Vidwans) but will help people looking for a basic start to improve their visual representation skills.

Few topics which are covered (basics of)
Page design (grids and breathing spaces)
Site design
Typography
Interface design (navigation)

http://webstyleguide.com/index.html