– Sketch’s UI: What's obvious and what's a little more hidden, navigating folder structures and artboards. 

– Styles: Text and Shapes.

– Naming conventions and exporting.

– Symbols Overview: How to create them and when to use them.

– Symbols: Resizing and overriding.

– Libraries: Sharing Symbols, Styles and files with others.

– Plugins: Manage and leverage plugins for an efficient workflow (InVision CRAFT, Anima and more)

– Anima's AutoLayout: building responsive layouts, grids, tables and more.