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bbPress uses the same concept as WordPress with add_filter and add_action so there are many guides out there as to how it works.

Essentially it’s a “hook” that allows you to intercept the process or results. The first part of the add_action/add_filter is the process name or trigger, the second part the the name of the function you want to process at that moment.

If there are existing filters/actions in place you can unhook them with remove_action or remove_filter.