Hi! Recently, when i looked at the scripts that my developers created, they do not use the local variable, but at some point they do, but i can’t understand how they differ?
This script:
And this one:
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A local variable is accessible only in the block where it’s declared.
A (non-local variable) is visible to all scopes of a script. In the following code
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Adding onto this, Roblox terms non-local variables to be called “global” variables. However, do not confuse that meaning with _G, (which many scripters also call global variables,) which are variables that can shared across multiple scripts.
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like how @Portal_l1 and @Icee444 said perfectly, for example if the local variable is in a function you can only call that variable within the function, if the variable is not local then you can call the variable from anywhere after setting it’s variable 
The code below would = nil
function example()
local hiVariable = ("hi")
end
print(hiVariable)
The code below would have an output = hi
function example()
hiVariable = ("hi")
end
print(hiVariable)
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If this is a client script, the only thing I can think of for the warn,oldwarn is trying to detect environment scripts which change warn,error,or print ( I cannot think of a single reason why anyone would need to do that, however, so I really don’t know why your developers did that. Maybe it was an old method of detecting environmental scripts? ) Anyways, the Part1 and Part2 could either be the developer changing an already existing variable outside a specific function, or wanting to change the global script environment to confuse exploiters. Either way, this confuses me.
A Non-Local Variable can be accessed anywhere in the script, a Local Variable can be only accessed in the enviroment it was made in. Also Global Variables can be accessed in any Script, here’s an example of a Global Variable: _G["Variable"] = "Hello World!". However they should not be used, mainly because Exploiters can access them, so you should use Modules, RemoteEvents, etc.