START A BITBreadboard
Push the legs of your parts into the holes: metal clips inside connect them, no soldering needed.
The five holes of one column are connected: a to e (yellow) and f to j (green). The middle gap separates the two halves. The long rails along the edges are connected along their whole row: + (red) and − (blue).
Two legs in the same column are connected. Two legs in the same row are not.
More: using the rails
Put a wire from GND to the − rail: now every part can reach GND from close by. The same for the + rail with 3V (Micro:bit) or 5V (Arduino). On some breadboards the rails are split in the middle: if a part at the far end does nothing, add a short wire to bridge the gap.
Columns are numbered 1 to 30 and rows are named a to j, so every hole has a name like e12. The wiring pictures on this website use these names.