psychological concepts & theories

1) In your own words, briefly describe 3 of the most important and/or interesting social psychological concepts, theories, or experiments you learned from this week’s module readings and other supplemental material, such as videos. 
2) Why did you choose these to be the most important and/or interesting? In what ways did these concepts, theories or experiments challenge or confirm your existing way of thinking about yourself, others around you, society? 
I have attached the reading for this week and listed some main concepts and definitions so you can ctrl+f through the reading and find whatever you need in there about any concept or theory. I also attached a sample response that received full credit so you can see what is expected.