In this tutorial I show you an easy, beginner-friendly way to use Actions in Unity to build interactive gameplay. The goal is simple: when my player cube collects gold/coins, I want a coin sound to play and the score UI to update instantly. To do that cleanly, I break the system into small scripts and connect them with an Action so everything stays modular instead of tightly coupled. First, I explain the core idea: in C#, a delegate is a reference type that points to methods, and Action is a standard delegate for methods that return void (with or without parameters). I also cover a super important detail—Action is a multicast delegate, meaning it calls every subscribed method in order. If nobody is subscribed, it’s null, so you must null-check before invoking to avoid errors. Then I walk through the setup: an Interactions script on the player triggers the “collected” Action on collision, while AudioController and ScoreManager subscribe/unsubscribe in OnEnable/OnDisable. When I test it, both systems fire automatically: the coin sound plays and the score increases, all in a clean, optimized workflow.