A breadboard is a tool for holding the components of your circuit, and connecting them together.
A voltage regulator is optional.
The short strips in the center separated by the divider, and the long strips down the side.
To set up a breadboard: All the holes in each of these lines are connected together with a strip of metal in the back. To see which holes are connected to which, take a multimeter and a couple of wires, set the multimeter to measure continuity, stick the two wires in two holes, and measure them with the multimeter. If the meter indicates continuity, then the two holes in question are connected. The components need to be adjusted accordingly to the voltage the breadboard takes.
How components are attached to the breadboard determines which the circuit will work or not.
Using a breadboard with micro-controller:
Arduino Nano 33 IoT or the Uno are the examples.
