Read, read and read! When it comes to other topics I'd say go on a Youtube dive, but with politics its a bit...wretched, people who don't know jack shit about what they are talking about often try and give definitions, and this goes for both sides, republicans don't know what an actual communist is and can't tell the different between them and socialists, and some leftists don't understand socdems, which is fair, things get mixed up in the great game of telephone.
Most people know about the basic stuff relating to leftism, so for libertarians and to a more extreme, anarcho-capitalists I'd start with "A Spontaneous Order" by Chase Rachels Chase and "Anatomy of the State" by Murray Rothbard.
Again, head down to a public library and browse for a bit in the political theory section, even if you disagree with what they believe in, whether a small amount or they are on a completely different axis than you, it's good to know 1. where they are coming from and 2. what they believe in actually.