The Design Thinking Workshop Kit - A free digital and print kit to help run your own workshop
Sketch Talk - A community for Sketch users of all skill levels
SketchCasts - A weekly screencast, all about how to use Sketch
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Sketch 101 by Designlab - Learn Sketch in this free course w/ downloadable templates
Scrimba - Interactive coding screencasts created in an instant