I've seen some people say it is unecessary to learn pitch accent, but with my
current knowledge, there are multiple ways to say a word with pitch accent and
if you don't know the pitch accent, the word would mean something else, so
wouldn't it be extremely important?

Also, do all words have multiple pitch accents?
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2018-05-27T20:00:27.600
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2018-05-29T08:55:50.757
2018-05-28T05:54:15.123
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pronunciation pitch-accent
How do you find pitch accent? Is it important?
The pitch accent of a word may vary across dialects and pitch accent is
probably not strictly necessary to make yourself understood — words which are
homophones up to pitch accent will usually be disambiguated by context. (Even
in a single dialect there are many homophones.)

However, if you choose to ignore pitch accent it will make your (foreign)
accent stronger.

Apart from looking up pitch in a dictionary listing pitch accent, being being
aware of the fact that pitch accent exists and listening out for it is
probably the best thing you can do. When you copy other people, try to copy
from people speaking the same dialect to give you a more consistent accent.

Also see

  * [How does pitch accent work in Japanese?](https://japanese.stackexchange.com/q/11194/1628)
  * [Multiple Pitch Accents](https://japanese.stackexchange.com/q/32781/1628)
  * [How important is one's pitch when speaking Japanese?](https://japanese.stackexchange.com/q/646/1628)
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2018-05-27T20:59:24.823
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I don't think there's a way to learn the pitch patterns except for listening
to a lot of material. It's not something you can really memorize, you just
have to absorb it via osmosis.
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2018-05-29T05:19:31.413
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