I have been advised that if you let people use your Mac, is it better for them to use A Guest User Account as when they have finished, all settings etc will be deleted and your Mac will be left "untouched", rather than running the risk of them changing settings etc and potentially "screwing things up" if you let them use your account - which could be a disaster.
Guidance on how to achieve/enable this, as well as disabling/deleting as necessary would be much appreciated ?