That understandable
Its a good practise to avoid using server script for UI or any changes that dont have to be replicated to all clients.
For Server/Client communication look up RemoteFunction and RemoteEvents
As of signal libraries i would recomend you using BadSignal for something more to be professional and very light weight or using GoodSignal if you are a begginer
I surpriced how ironic this 2 names are tbh LOL;
Main reason why people made them is becouse of Defered Signal implementation from roblox
Hower that doesn’t affect you if you use Imideat Signal engine from roblox;
Also using Custom signal library creates a bit lesser overhead than roblox’s bindable event as since it doesnt require you to allocate unneeded memory for whole instance