Client, server, shared: three folders, one resource
Open almost any serious FiveM resource and you see the same three folders: client/, server/, and shared/. They are not decoration. Each one runs in a different place, and putting a line in the wrong folder is how beginners leak secrets, crash the client, or wonder why a value is nil. This lesson builds the split for real and then teaches the rule for deciding where every line you write belongs.
Build it
Make the resource folder
Inside your server's resources folder, create this folder:
resources/qu_client_server_shared