You can't get very far by completely faking it. Someone with more knowledge, more connections, more something, will call you out.
But in the process of not knowing something, just a little faking it goes a long way. Because if you know a little, you know where to look to find a little more...in order to get better at faking it.
You fake it a little further, and then you go find information to make the faking it even more believable. Because what you are learning becomes your new truth.
All of a sudden, without meaning to, you become a quasi-expert. And then you REALLY have something to talk about.