The Design of Everyday Things - A timeless book, The Design of Everyday Things explores the fundamentalprinciples behind all design, and how to understand the psychology behind how we use things, and why they frustrate us.
Design Principles - An open source repository of design principles and methods
The Elements of Typographic Style - The primary form of communication on the web is through text which makes typography one of the most important aspects to design for.
Facebook Design Resources - A collection of free resources made by designers at Facebook
CS50x - HarvardX (edX) - An introduction to the intellectual enterprises of computer science and the art of programming.
Facebook - Connect with friends, family and other people you know. Share photos and videos, send messages and get updates.