Learning is natural. We learn something new daily by reading articles, from friends, doing different things, etc. In your profession learning new things is very important for your existence. In the Design industry, new trends are coming day by day. So it’s important to refresh your design skills to improve your productivity. Have a look at these Free eBooks which may help you to learn new things. Enjoy 
Web Design Book of Trends 2015-2016
10 Pro Tips for Smarter UX Design Process
The Guide to UX Design Process & Documentation
The UX Reader
ADAPTIVE WEB DESIGN
Web UI Design Best Practices
Winning Over Users With Attractive UI Design
Designing Better UX With UI Patterns
Web UI Trends Present & Future: The Elegance of Minimalism
Color Theory in Web UI Design
Elegant Web UI Design Techniques
