I kinda get how to script and stuff, but I just need to get a more feel of it and understand functions, I'm not sure if this is a dumb question or not, but any help is appreciated
You can't actually modify the build-in Health indicator.
The Humanoid
in your character enables that Health bar, although it is possible to hide it by setting Humanoid.HealthDisplayDistance
to 0
.
In order to replace the Health bar entirely, you'll have to make a custom one using GUI.
If you have any questions about using GUI, feel free to ask here!