Many people associate the word "libertarian" with right-libertarianism, which is the predominant form of libertarianism in the United States. Ayn Rand's philosophy of objectivism is right-libertarian.
On the other hand, left-libertarians oppose capitalism while supporting personal property rights. Left-libertarians and right-libertarians find common ground in rejecting authoritarian governments.
Libertarianism comprises a diverse collection of views that aim to advance individual freedom, and anyone who is not an authoritarian is likely to agree with some libertarian principles.