Don't Make Me Think - Originally written in 2000, Don't Make Me Think is one of the original books on web design and usability. Although it's been around for a while, the goals and lessons of the book are universal and apply to websites today.
Uxcel - The easiest way to learn UX/UI design
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.
UX Challenges - Done reading about UX? Start doing it.
Coursera - "Compilers" by Stanford - The course explores how high-level languages are compiled to low-level assembly.
UI Coach - Become a better UI designer in 30 days