Running openHAB Core

Does running openHAB Core requires dropping jars somewhere in the distro files too like the addons repo? If I ever decided to make a contribution do I need to build the specific jars for the specific module related to it? Or does it run directly from Intellij? The documentation doesn’t mention details about it but only for the addons

Edit: I found a folder under:\openHAB\runtime\system\org\openhab\core\bundles
for the jars related to the core framework