The Roman Catholic basics are detailed in The Baltimore Catechism; as in, this pertinent question and answer:
Q. 150. Why did God make you?
A. God made me to know Him, to love Him, and to serve Him in this world, and to be happy with Him forever in the next. ~The Baltimore Catechism, source
“…and to be happy with Him forever in the next.”
May you have a good day.
~Top image: “Rosa Celeste: Dante and Beatrice gaze upon the highest Heaven; from Gustave Doré’s illustrations to the Divine Comedy, Paradiso Canto 28, line 16–39″ (source)