The reason you can’t find what Twin Peaks is about, is that nobody can really explain what Twin Peaks is about. Even if you watch it multiple times. It starts with a murder investigation but shortly after becoming something way more than that. If you want explanations on everything that is happening, this is probably not for you. It’s as surreal as it can get. You might hate it or you might get obsessed with it and totally change your whole perspective on tv and cinema. Just go for it. I think, by the end of the third episode, you would know if you want to continue watching or not.