I like the Circuit Playground for getting started: https://learn.adafruit.com/adafruit-circuit-playground-express https://learn.adafruit.com/adafruit-circuit-pl

I like the Circuit Playground for getting started: https://learn.adafruit.com/adafruit-circuit-playground-express https://learn.adafruit.com/adafruit-circuit-playground-expre... It has a lot you can do without attaching external devices.