Necessities
What movies from any generation are necessary for an anime collection?
shareAnother poster already mentioned Miyazaki, Kon, and Hosoda. Their works are all pretty widely-known so they're a good place to start, particularly in film. I would personally also recommend the works of Makoto Shinkai, Keiichi Hara, Takahiro Omori, and Katsuhiro Otomo.
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Why don't you take a pill, bake a cake, go read the encyclopaedia.