Only thing missing is a good tutorial on Modules/Pathing

Hello, I am trying IntelliJ after coming from Jbuilder.
I have a project in this directory:
and some common stuff in:
i would like to set up a project that uses both of those, but i don't understand what i set as the content root and how i refer to each of the packages.
also, if i have multiple files in the package com\streetside\utils and they want to reference each other, it says it can't find them, even though they are in the same directory and package.
please help!

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