Designing for the Web
Differences Between Print Design and Web Design
Jakob Nielsen
http://www.nngroup.com/articles/differences-between-print-design-and-web-design/
Effective Visual Communication for Graphical User Interfaces
Suzanne Martin
http://web.cs.wpi.edu/~matt/courses/cs563/talks/smartin/int_design.html
Web Design Guidlines (German)
Peter Lepke
http://nibis.ni.schule.de/~lepke/homepage/webdesign/webdesign.html
F-Shaped Pattern For Reading Web Content
Jakob Nielsen
http://www.nngroup.com/articles/f-shaped-pattern-reading-web-content/
Four Key Principles of Web Design
Alex Bigman
http://99designs.com/designer-blog/2014/11/07/web-design-basics-guide/
Ten Principles of Effective Web Design
Vitaly Friedman
http://www.smashingmagazine.com/2008/01/31/10-principles-of-effective-web-design/
Crash Course: Web Design for Startups
Paul Stamatiou
http://paulstamatiou.com/startup-web-design-ux-crash-course/
Responsive Web Design
Ethan Marcotte
http://alistapart.com/article/responsive-web-design/
Responsive Web Design Fundamentals
Pete LePage, Google Developers Resources
https://developers.google.com/web/fundamentals/layouts/rwd-fundamentals/
Experimenting with CSS
scratchpad.io [realtime HTML/CSS editor]
http://scratchpad.io
CSSizer [another realtime editor]
http://cssizer.com
Getting to Know CSS
Shay Howe
http://learn.shayhowe.com/html-css/getting-to-know-css/
Learn CSS Layout
http://learnlayout.com
Hello, CSS World
http://www.css3-tutorial.net/introduction/hello-css-world/