So far my little princess(a year and seven month old by August 15, 2018) has learnt the value of appreciation. She's becoming master in it. Give her biscuits and she would say thank you immediately, sometimes before biting it.
I am working on teaching her the important of being patient and making mistakes. Have noticed that anytime she tries to wear her shoes, she feels angry and aggressive when she's not been able to achieve that. I hope that works too. Learning is a continues thing. We will continue to learn, unlearn, and relearn.