It’s a mitzvah to rejoice on Purim we party and we are also meant to make others happy as well. Rambam writes (Hilchot Purim Chapter 2):
Similarly, a person is obligated to send two portions of meat, two other cooked dishes, or two other foods to a friend, as implied by Esther 9:22, "sending portions of food one to another" - i.e., two portions to one friend. Whoever sends portions to many friends is praiseworthy. If one does not have the means to send presents of food to a friend, one should exchange one's meal with him, each one sending the other what they had prepared for the Purim feast and in this way fulfill the mitzvah of sending presents of food to one's friends.
One is obligated to distribute charity to the poor on the day of Purim. At the very least, to give each of two poor people one present, be it money, cooked dishes, or other foods, as implied by Esther 9:22 "gifts to the poor" - i.e. two gifts to two poor people.
We should not be discriminating in selecting the recipients of these Purim gifts. Instead, one should give to whomever stretches out his hand. Money given to be distributed on Purim should not be used for other charitable purposes.
It is preferable for a person to be more liberal with his donations to the poor than to be lavish in his preparation of the Purim feast or in sending portions to his friends. For there is no greater and more splendid happiness than to gladden the hearts of the poor, the orphans, the widows, and the converts.
One who brings happiness to the hearts of these unfortunate individuals resembles the Divine Presence, which Isaiah 57:15 describes as having the tendency "to revive the spirit of the lowly and to revive those with broken hearts."
I think that we should learn from here a general rule for life: Don’t Forget to Make Others Happy as Well.