Kid President's 20 Things We Should Say More Often

Are there things we can say more often? Do you think of anything we can say to people so we can be nicer to them? Is there any experience that you remember and would like to share? Has there been any piece of advise given to you that has enlighten your life ?
Please, take a few minutes and think how you can improve things and be nicer to people. What are the things you can do?
Thank you.