Learn to congratulate people on their achievements no matter how minute. They even may have beaten you in a debate, a sports event, or an election in school or government; still congratulate them. It is a sign of civility and kindness.
Achievements in this light could be a newlywed, someone who just graduated from school, someone who got promoted, someone who gave birth or bought a car, the list is endless. You can practice doing that today, if you haven’t already.