How to make a working health system

I'm new to unity and I'm trying to figure out where to start. I followed this (

) tutorial to make the hearts and thats as far as I've gotten. I go to watch other tutorials on making the ui work with the game but I just get lost because all of my scripts are different from theirs and I get confused on where to put things. I've also used Brackeys tutorials (

) on player movement and his character controller which I feel like can make things even more confusing because I have 2 different scripts that control the player.

So what should I do? I also don't know what part to create first. Which do I create first health pickups, enemy damage, or player damage? I just don't know where to start to tackle this.

 

The Unity Learn tutorial, Ruby's Adventure: 2D Beginner, covers all the things you mention.

 

Omg dude, I just went though this and let me tell you something... FFFFFF THAT TUTORIAL. I tried and man, it is great but SO overly complicated. Check this series out instead:
https://www.youtube.com/playlist?list=PLiyfvmtjWC_X6e0EYLPczO9tNCkm2dzkm