I have started my first basic project today and I have a few questions I couldn't find answers to yet or I just don't know how to search for any. Sorry if those questions seem a bit stupid, but I will just try to be pretty straightforward.
Whenever I start my Pi with a breadboard and LEDs connected they will be "On" for as long as I will start any program which starts controlling their input. I haven't seen this on any tutorial video I have watched, is that normal? How can I keep them "Off" from the beginning?
I connected several LEDs on GPIO pins 3, 5, 7, 29, 31. The LEDs on number 3 and 5 were much brighter than the other ones, is there any reason to this? Also I just read that only certain GPIO pins can/should be used for outputs, while I thought any of them would do. Can't I use any GPIO pin for eg. controlling an LED?