Hello all! I am currently working on an Indie Horror game and I need to have a box colliding with a trigger and you clicking left mouse activate an event. But I can press left click at any time and it still executes the command. I was using this as a reference but I couldn’t figure out what the two-input-one-output event seen in the picture. If anyone could help it would be much obliged. Picture → https://docs.unrealengine.com/latest/images/Engine/Blueprints/UserGuide/Events/BeginOverlapEX.jpg . Cheers! 
You can create functions and macros with custom inputs and return values. As an example, if you place the “Flip Flop” node, you can double click on it to see the macro that it is made of.
Cheers! 