From the OakDev Tech blog:
With our new CP Sapling, there is a world of possibilities that you can explore with the SAMD21 microcontroller. And thanks to the hard work of Adafruit, there is a ton of great examples that can be used to explore microcontroller functionality and make a few cool projects to impress your family this holiday season!
As always before we get started, if you have never used a CircuitPython board like the QT PY, be sure to check out Adafruit’s learning site to quickly get started with your new board. –> Adafruit Learning Site: Getting Started With CircuitPython