The hardware for this project is very simple, you only need a Circuit Playground Classic or Circuit Playground Express board! Everything necessary to make the fidget spinner is built in to the Circuit Playground board.
If you're planning to build the Arduino version of this project you can use either the Circuit Playground Classic or Circuit Playground Express board (the express board is newer and has a fancier microcontroller with more memory and features compared to the classic board).
If you're planning to build the CircuitPython version of this project you can only use the Circuit Playground Express board. The older classic board won't work because it isn't powerful enough to run Circuit Python code.
Before you get started make sure to follow the guide for your board to check you can program and load code onto it (in particular you might need to install drivers for some platforms like Windows):