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i presume equals() also compares hashCode values, meaning i should only include values in the hashCode function that i depend on in the equals function?

By default `equals()` just compares if the object reference is the same which isn't really that useful, so you have to override `hashCode()` so that it compares if the values inside are the same or not. It's also used in Collections a lot. Most IDEs come with `equals` and `hashCode` generators. Also Kotlin's data classes implement these by default, so for those you don't need to override.

hashCode() is used for efficient lookup when objects are stored in HashMap, HashSet