Review
Slightly above an hour in duration, Learning Typescript will nicely guide you through the basic drills of setting up Typescript and adding it to an existing project, alongside explaining the basics: types, interfaces, classes, enums, literal types, a small introduction to generics and type declarations. It can’t go in depth but I was pleasantly surprised of how focused it is, perfect to get a general idea.
Oh, and it even manages to mention some cool tools and projects like DefinitelyTyped, for those third party libraries you might be using that don't provide type definitions yet.