For me? The first anime related thing I saw as a kid was Spirited Away on VHS, I was awestruck from the animation and quality of the film.
For shows it would've been the usual Pokemon and DBZ. As I grew older I suppose my first proper anime show was watching streams of Neon Genesis Evangelion due to people talking about it at school.
My parents bought me My Neighbor Totoro when I was a kid. I absolutely loved every second of it. Then I came across Ranma 1/2. Next came Kiki's Delivery Service. It kind of snowballed after that.