There is so much information that is packed into a semester that it is probably going to be hard to remember much of it five years from now. However, I don't think I will ever be able to forget the principles of scientific thinking. Ruling out rival hypothesis, correlation vs. causation, falsifiability, replicabiliby, extraordinary claims, and occam's razor are forever burned into my brain.
I feel that learning the principles of scientific thinking has been really beneficial for me to know because they have allowed me to really question what others are telling. I am now prepared to look at the world with a more scientific mind.