How does Gratitude Work

If it’s saying thank you to people to earn points with something then I dont get it. Im working hard on trying to find methods to improve but Im not sure I found a method right for me. Is there any recourse for my growth? Is gratitude and telling everyone thank you the way? If it is, allow me to preemptively say thank you if you express kindness. If you don’t, then dont be rude!