I'm trying to replicate GUIs to other player's screens. I'm unsure of how to problem solve?

I'm trying to recreate replication with GUIs so other player's see other player's 2D space ships. The problem is, I'm unsure how to think of a solution to this kind of problem. It is also a necessity for replication to be secure as an exploiter can turn themselves invisible and ruin the game.

I need basic ideas on how to replicate with GUIs and not full blown solutions so I can better understand. I honestly don't know what to do and can't problem solve yet except if ReplicatedStorage or ReplicatedFirst is gonna help with anything.

Any help is appreciated and happy new years!

You are not approaching the problem with the right perspective.

You do not need to replicate the GUI elements. You need to replicate the information about the ships faithfully, and then each client can locally render those ships using GUI.

LocalScripts can call RemoteFunctions on the server, which create/change/move ships. The ships could be represented using objects in the explorer, or they could be tables that can be fetched using RemoteFunctions/RemoteEvents.

Each client requests information about where all the ships are, and then locally creates the necessary gui elements to show them.