There are a few constellations I learned how to use to find the North Star. The videos are made by one of my favorite YouTube channels called Alfieesthetics. He has a lot of great survival videos, and he is fairly funny. Just a heads up though. He does curse a little so probably do not want to watch around young children.
http://m.youtube.com/watch?v=K2nx8VqvfQY
Orion
http://m.youtube.com/watch?v=eSRAZrrMRQI
Cassiopeia
http://m.youtube.com/watch?v=_xnv6JE69TE
Summer Triangle
http://m.youtube.com/watch?v=n_gT9nBfhfo
Ursa Major--AKA the Big Dipper
http://m.youtube.com/watch?v=kZL0qGkoJIk
Bonus: Using the sun and sticks to find north