Did you want to light the LED and you got turned down on the fly? libgpiod!
Reading is keen, photoresistors are nice, and educating on Ideas from Books are both!
Often web server access to remote devices behind a firewall is needed (Wifi router, smart home). This is how you can solve this securely.
Did you ever want to know if you were moving while you slept?
Do you like Linux/Embedded Linux? Do you like IoT? What about using SigFox in your Linux IoT projects?
Did you ever want to use another radio band to control your LED from a distance w/ an Xbee by way of push button?
Are you interested in visual plotting for statistics? Matplotlib!
Make GPIO easy and easier but do not try to make it a given...
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 learn something but it seemed impossible b/c of too many articles on the subject or not enough? BBBW!
Did you want to handle some 12v servos with your BBBW and make them available with an already completed SDK?
Did you ever want to start making a four legged bot and did not know where to start?
Did you want to see different aspects in a visual manner w/out Matplotlib or Numpy on ARM devices?
Did you ever want to view a nice visual of a fractal image on an embedded computer with the correct source?
Did you ever want to lock your door from your computer or via WiFi?