Depends on how it’s defined.

Current libertarianism is just rebranded reactionary conservatism.

Classically though, “libertarian” simply referred to someone who advocated for maximum individual liberty and minimum state intervention. The term first gained popularity in the US in the wake of the New Deal, when the term “liberal,” which had up until then referred to that position of maximum individual liberty and minimum state intervention, was coopted by leftist authoritarians. Since the classical liberals needed a new term, they shifted to “libertarian.” And notably, at that point, libertarians were at least as likely to be left-wing as right, with the two groups merely splitting on which specific government services should be counted among the minimum.

That started to go wrong when the Libertarian party was established, and finished going wrong when the Tea Party was transformed from a series of protests against the Wall Street bailouts to a traveling carnival of hate.

And there’s also the political compass sense of “libertarian” as simply the opposite of authoritarian, by which I’m as “libertarian” as it’s possible to be. It should be noted though that in recent years, mostly through meme communities, even that conception of “libertarian” has been increasingly characterized as more of an alternate authoritarianism.

So there’s a conception back behind each use of the term “libertarian” that is at least close to mine (I’m actually an anarchist). But IMO not coincidentally, the term has been in all cases warped to refer to some form of authoritarianism, which I unequivocally oppose.

I don’t think libertarianism works, it relies naively on how the free market is omnipotent, how freedom is everything and how having a small government is somehow good. There are no countries that are entirely libertarian, that also tells a lot about the ideology’s applicability in practice. A brilliant book about why libertarianism doesn’t work is a book “A Libertarian Walks into a Bear”. In the book, a group of libertarians decides to take over the small town of Grafton in New Hampshire en masse as part of their “Free Town Project”. Of course this group cares neither about the town’s original inhabitants nor their rights. What’s the result? They hollow out pretty much everything from the library, to the school, the fire department and the police. No regard is given to any laws on hunting or food disposal, and that lures in bears, who turn so aggressive that they invade people’s homes. In addition to bears, sex offenders and all kinds of criminals are also lured into Grafton. It’s pretty entertaining book, I recommend it.

Another reason why I dislike libertarianism is that it can function as a gateway to fascism. This is a known phenomenon. Several key figures in the alt-right for example used to be libertarians. I stumbled into a clip from some American Libertarian Party convention where Richard Spencer was with Ron Paul. I had to rub my eyes a bit.