How do I identify "Luxury" authentic bags from fake ones?

I’ve been looking to invest in some high-end luxury bags, but I’m really struggling with knowing how to tell if they’re authentic or not. With so many knockoffs out there, how do you spot the difference between a real designer bag and a fake one? I’m talking about the subtle details like stitching, hardware, and labels. If anyone has tips or things to look for, I’d love to hear your thoughts!