Reading is keen, photoresistors are nice, and educating on Ideas from Books are both!
Are you interested in visual plotting for statistics? Matplotlib!
Did you ever want to learn something but it seemed impossible b/c of too many articles on the subject or not enough? BBBW!
Did you want to see different aspects in a visual manner w/out Matplotlib or Numpy on ARM devices?
Did you ever want to use another radio band to control your LED from a distance w/ an Xbee by way of push button?
Have you ever wanted to know how to make sure your front door, any window in the house, or your backdoor stays shut or else?
Did you ever want to know if you were moving while you slept?
Did you want to light the LED and you got turned down on the fly? libgpiod!
Make GPIO easy and easier but do not try to make it a given...