Using this tutorial to learn how to make Christmas Tinsel (https://www.youtube.com/watch?v=W2YFHXJDWJk). At 9:08, they add edges to the object using an "Edge Loop" I believe in order to use proportional editing to give the object a curve like so:
I am unaware how to do so. The closest I can get to this (Image below) using the subdivide option by right clicking.