There's resources in these guides that go beyond what's covered in this tutorial. The introduction guide is all about setting up your Circuit Playground Express board. The Circuit Python introduction guide walks you through all of the pinouts, sensors and everything you need to know.
The Circuit Playground Express can stay connected via USB power from either a wall adapter or computer's hub. This allows the Christmas Tree to stay lit as long as you want (nightlight mode anyone?). The Christmas tree has a cutaway to accommodate for a USB cable. Lipo battery is optional and can be tucked in between the Circuit Playground Express and 3D printed mount.