Never watched any

Start with fullmetal alchemist brotherhood, great story, loveable characters, and it has an actual ending. After that you can watch the series before it which has some of the same story beats but has a different ending to it.

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I recommend starting with feature films. Your Name, Voice Form, Weather Child

hunter x hunter or attack on titan

maybe start with hunter x hunter

watch Hayao Miyazaki, the rest is nonsense