Design has been fairly commodotized.

Free

1. Material CSS
2. Metro UI
3. Bootstrap
4. Semantic UI

Paid

1. Theme Forest

Icons
Photographs

Can all be bought or downloaded for free.

Interactive Design is new is a new breed of HTML5 design that focus on
Game like interactions.

Skills

1. Layout
2. Colors
3. Typography
4. Accessibility

Tools

1. Photoshop
2. CSS3 / WebGL / Javascript
3. D3

Books

1. Desig of Everyday things
2. Don’t make me think
3. Elements of Typographic Style
4. Designing Interactions

http://www.hcibib.org/