part of being a programmer is staring at stuff for hours and hours, not knowing what to do, and then eventually figuring it out. It’s not always going to be easy
When I’m in your position, I usually just stop my current project and make an empty project. Then try to achieve a really really simple example of what I’m confused about in the empty project.
So, if you’re confused about replication, start a new project and just replicate some really simple things like color changing and animations. Then you will eventually learn the fundamentals and maybe be able to fix your original project.
Also, see if there’s some other way of getting the result you want, like instead of using replication, just use RPC’s everywhere