Which file of wordpress manage plugins functionalities?

Which file of wordpress manage the plugins functionalities. For example if a have to insert another rule in a plugin functionality where i go to modify?

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  1. There should never be a case where you edit the core. Filters and actions were created so plugin developers could navigate the intricacies of WordPress wihtout touching core files. You should reference the following:

    There are quite a few undocumented filters that I find when viewing WP core. If you do go to core, I would look for a filter that’s being used in the area you wish to alter WordPress rather than change the file outright.