Check out my python crash course for getting started with CircuitPython.
Go through these tutorials on adafruit. They are consecutive and build on each other.
Bonus, if you have time.
And a Challenge!
Use your pico and LED to create a light animation. Get creative! You can use the lights to animate a scene or something. Add a video and a screenshot of your code to the slideshow shared in Canvas.
Here is a folder with all the examples for class.