If you are like me you want to tear your hair out if you are making your first circuit on a breadboard without understanding what it really is. So YouTube to the rescue! Try this one by the Science Buddy - https://www.youtube.com/watch?v=6WReFkfrUIk
Next let's just see if we can get the Metro Express led to blink - https://learn.adafruit.com/circuitpython-essentials/circuitpython-internal-rgb-led