I help lots of people and understand them fine. You aren’t explaining yourself clearly. BlueprintCallable lets a blueprint call into C++, and BlueprintImplementable lets C++ call into the blueprint (when implemented). Pick the one you need. But if it’s not calling a C++ function from the blueprint then you’re probably designing it wrong. I assumed you meant expose a C++ function to blueprints because the other way around is kind of dumb unless it’s used to trigger events.