More reference you can click the link below:
BBC micro bit Pins: http://micro:bit.org/guide/hardware/pins/
BBC micro:bit website: http://micro:bit.org/
Micro bit MakeCode Block Editor: https://makecode.micro:bit.org/
Meet micro:bit starter programming: http://micro:bit.org/guide/
BBC micro:bit Features Guide: http://micro:bit.org/guide/features/
BBC micro:bit Safety Warnings: http://micro:bit.org/guide/features/
BBC micro:bit Quick Start Guide: http://micro:bit.org/guide/quick/