Sketch Talk - A community for Sketch users of all skill levels
Mindvalley - Mindvalley is an online education platform that facilitates users by connecting them with numerous strong-minded people worldwide and sharing knowledge or ideas through chatting, meetups, and video calls.
SketchCasts - A weekly screencast, all about how to use Sketch
FutureLearn - Free online courses from top universities and cultural institutions
Sketch 101 by Designlab - Learn Sketch in this free course w/ downloadable templates
VTC - Enhance your software, business and creative skills with more than 1000 online course titles with certifications, exclusive training by VTC