For me there is a lot that makes me happy! I think making people laugh and improving other people's days really is the big thing that makes me happy. Like there is nothing better than making someone burst out into laughter and just seeing the joy in their face from what you said.
Another one I have recently experienced a lot of is working toward a goal and putting a ton of work/effort into it and finally achieving the goal. The satisfaction of knowing you accomplished something big makes me happy and gives me confidence!