Ok, so if I buy a first guitar with a tremelo bar, if I don't use it go out of tune? And if I do use it, is it certain it will go out of tune? If I whammy regularly, will the guitar be harder to keep in tune when not using it?
as long as the bridge is set up correctly... it will work fine (even cheap tremolos)
If you don't use it, shove a block of wood up in there to stop it moving and things.