The objective of this tutorial is to light up an LED by the micro: bit card.
As for the assembly, it is easy to connect LEDs to the micro: bit either by using alligator clips or a micro: bit breadboard adapter. We connect the Po pin of the micro: bit card to the resistor, then the anode (+ terminal) of the LED and the cathode (- terminal) to the micro: bit GND. There are many mounting methods and here are some examples:
Here is the makecode program which allows to light an LED connected to pin P0 of the micro: bit.