The first blueprint was for the Master Interact. This is simply a custom event that fires when the key ‘E’ is pressed.
The second blueprint was a Line Trace, this allows the player’s gun to fire a line directly from the gun and into an object. The line trace allows the blueprints to know what is targeted for the Master Interact.
The third is a Line Trace Check, this allows the player to add a Print String to the line trace. Adding this will mean that the player can identify what the line trace is hitting when it is fired.