Further reading
MicroPython’s home page has a lot of documentation hosted at https://docs.micropython.org/en/latest/. It is worth exploring it. Also, if you are interested, you can visit the documentation of Python 3 hosted at https://docs.python.org/3/. The MicroPython port specific to Micro:bit is documented at https://microbit-micropython.readthedocs.io/en/v2-docs/.