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.
Very first was probably Inuyasha, Dragonball Z, or some Gundam way back on adult swim as a kid. My first real one that I engaged with as a semi-adult was probably Death Note.