I didn’t know much about anime either, so I decided to start with the Big 3. I watched Naruto and its continuation of Naruto Shippuden, Bleach, and One Piece. One Piece is still going, but I’m caught up. Just letting some episodes pile up so I can watch many at the same time. I thought they were all good for different reasons, but yes there are filler episodes. The fillers of One Piece were more tolerable in my opinion than those in Naruto. Bleach had side arcs which were still entertaining as well. Since Naruto was first though, it will always have a special place in my viewing history.
Other Anime I’ve seen and liked:
Death note was great, but I was disappointed with how short the series was since it gets so much praise.
Fullmetal Alchemist was great, the Brotherhood version is supposedly better but I have only seen the first so far, and it summarizes the first series in its first portion.
My Hero Academia
Hunter x Hunter
Demon Slayer: Kimetsu no Yaiba, good but also short.
One Punch Man - Satire about superheroes, pretty funny
The Disastrous Like of Saiki K
Haikyuu! This was a sports anime, very different from the others, but I enjoyed it a lot. It’s about a middle school men’s volleyball team.
I loved Avatar: The Last Airbender, but not sure that’s anime.
I liked Korra, its sequel, but not as much.
Blood of Zeus was good.
Wasn’t a fan of Jojo’s Bizarre Adventure, maybe it’s the accents.
I watched Pokemon and Yugioh as a kid too.
Ones I want to watch or check out:
Attack on Titan
Mob Psycho 100, another comedic one
All Dragonball series, it’s gonna take forever
This is all according to my opinions though, you should look up stuff about these shows and decide on your own which ones you might be interested in. I might be completely wrong about some or all of these. Good luck!