SharePoint - Event Registration

Good morning everyone.

I'm just starting with SharePoint at work. I was excited first Disappointed then realized that I was just ignorant 🙂

Now, I'm trying to use the Event Webpart and allow participant to register.

I found a similar question answered by RobElliott  here  but I think it's already too advanced for me right now.

I understand that the event links to a form, that this form once submitted will interact with a list and from the result of this interaction, will send a positive/negative message to the participant. 

Could someone guide me on how exactly to do that ?