I need a website that has many Raspberry Pi projects! In particular for electrical projects for kids, especially projects that will impress the kids. I will be mainly working with the GPIO pins.
It must be raspberrypi.org
Have a look at https://www.raspberrypi.org/help/physical-computing/ for GPIO and https://www.raspberrypi.org/community/
The official website is https://www.raspberrypi.org/
I really like Adafruit for kits and projects here: https://learn.adafruit.com/
Instuctables also has a lot of projects: http://www.instructables.com/id/Raspberry-Pi-Projects/
Hope this helps!
In my opinion, make has the funnest electronics projects for kids.