In your basic Austrian style Libertarianism Government only has three proper functions: External Defense, Internal Policing, and Enforcement of Contracts.
Or we could simplify all that as: Protection of Private Property, Protection of Private Property, and Protection of Private Property.
It really is that simple, at least once you define private beliefs and personal freedom as property. And property does mean “pertaining to me, my own”. A neat circle.
“Middle English propre proper, own, from Anglo-French, from Latin proprius own”
“Amour propre” French for “love of self”