Need help understanding something with Kanji

I am starting to learn Kanji using WaniKani and I can’t seem to understand how there can be multiple pronunciations for one Kanji

Take 人 as an example
Pronunciation in 日本人: にほんじん
Pronunciation in 一人: ひとり (also 一 is not pronounced いち)

I don’t know if it’s just a memorization thing of remembering all the pronunciations or if there’s some type of conjugation based on kana/kanji around a specific kanji. Any help/resources or explanations would be helpful and appreciated!

by Ill-Highlight1002

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