A liberal is a person who advocates for a
system in which everybody can coexist pacifically without anyone forcing
sb into doing what they want. This implies that for example, Christians cannot but convince peacefully that their belief is the
best.
The state shouldn't intervene either, except for some few areas: military,
police, minimal social assistance and the judicial system to enforce the
non-aggresion laws. In this
line of thinking, Milton Friedman is one of the greatest exponents of liberal ideology. Any
tax is considered theft, since it's an aggression to private property, but some can be considered so beneficial and so inexpensive that may be justifiable.
There is a natural tendency to want to be the most liberal in the room. Some even advocate for anarchy: no state intervention at all. The rest are called minarchists, and hated by the radical anarchists.