How to know delta of option?

Hello there, could you please explain in simple terms how one can determine the delta of an option? I understand it's related to the sensitivity of an option's price to changes in the underlying asset's price, but I'm struggling to grasp the exact calculation or estimation process. Could you guide me through it, step by step? It would be immensely helpful if you could also provide some real-life examples or scenarios to make the concept clearer. Thank you in advance for your assistance.