Does calling 'return' in your code make your code run from the very beginning? And could someone explain what 'return false', 'return true', and any others do please?

return stops whatever function it's in. When it is inside a function, and you call, for example, return 2, it will stop the function and give back 2.

function giveMeTwoPlease()
   return 2
   game.Workspace.Part:Destroy() --This code will never run.
end

aNumber=giveMeTwoPlease()+1
print(aNumber) --This will print 3.