In my libertarian days, Ayn Rand had not yet melded the hippie free love movement into libertarianism. It has changed a lot.
My opinion on vocabulary and how it has evolved.
libertarian — Used in Europe. It originally meant “anarchist”. No government. People can function just fine without coercion. Some libertarians wanted socialist communes, and some libertarians wanted unbridled capitalism and a free market. Anarchism was a dynamic political arena, with some good ideas and some bad ideas.
Libertarian — Used in America. Third largest political party. Favoring small government. Fiscally Conservative and socially Liberal. As with any political party, there are a range of positions and no set Libertarian position on every issue. Libertarians can disagree with Libertarians on issues, just as non-Libertarians can.
Anarchism — Originally, a belief in no government. Equivalent to libertarian (see above). Today, anarchism just means Marxism. The word anarchism has been seriously debauched by the Left. They do this a lot. I have known many “anarchists” in recent years. They want big government, high taxes, lots of control so that the rich cannot be rich. Anarchists today see a great need to control people, because people make bad choices. That’s just not anarchism. It’s closer to Marxism than anything else.