SketchCasts - A weekly screencast, all about how to use Sketch
The Pragmatic Studio - Learn the Ruby programming language, and get ready for Ruby on Rails, in this step-by-step, project-based video course.
GoRails - Ruby on Rails screencasts for Web Developers
Hackr.io - There are tons of online programming courses and tutorials, but it's never easy to find the best one. Try Hackr.io to find the best online courses submitted & voted by the programming community.
Sketch Talk - A community for Sketch users of all skill levels
Codecademy Ruby course - Learn Ruby, a flexible language used to create sites like Codecademy. Ruby is a powerful language for professional web apps all over the world. Discover Ruby arrays - a fundamental pillar of Ruby.