Here you will find the Official Synfig Video Course, freely available on Youtube as a playlist [english] [français].
Here are the files used in the tutorials: Workshop.zip
You can also visit the corresponding pages on Morevna Project’s Site (Workshop.zip with Lesson 2).
Other videos are available on Synfig’s Youtube channel, don’t forget to subscribe !
Lesson 1: Introduction (Support)
Lesson 2: Your First Animation (Support)
Lesson 3: Rendering (Support)
Lesson 4: Simple Character (Support)
See also here for the handles since 1.4.0