Hello Experts,I just started my journey with Arduino. I got hold of starter kit and did couple of exercises like Get to know your tools, Spaceship interface, Love-o-Meter etc. The circuits used in these exercises connect some resister to ground and some to 5v. I am trying to understrand, how do we decide if we have to connect resister to ground or 5v. Also known as Pull Up/Pull Down resister.I am not able to get the concept of using one in our circuits!!