The schematics of an electronic circuit is the most useful tool for an embedded developer, as it indicate how the different components on the circuit are interconnected.
Download the schematics of the micro:bit from https://github.com/microbit-foundation/microbit-v2-hardware/blob/main/V2.21/MicroBit_V2.2.1_nRF52820%20schematic.PDF , and store it on your computer. You will use it throughout these labs.
Your instructor will walk you the high-level components of the micro:bit
what is the exact model number of the target MCU?
which pins on the target MCU are labeled COL1-5 and ROW1-5