There is an example macro pack you can find in the downloads section of the website. It contains 7 different macros which basicaly replicate existing nodes with more low level ones as a learning material. The macros included are:
Chance
Check Object Tag
Coroutine
Flip Color
Flip Flop
Latch Boolean
Pathfind
Also, if you create any macros and want to share, here is the place 🙂