I found a seller on Instagram offering a Dior 30 Montaigne bag at a good price. But I'm afraid it might be a fake. Are there any basic signs I can look for myself to avoid buying a fake?

The best option is to check the bag for several parameters: hardware, seams, materials, and logos. There is an excellent step-by-step guide on the website https://legitgrails.com/blogs/dior/real-vs-fake-dior-30-montaigne-bag-legit-check , where genuine and counterfeit options are analyzed in detail. There you can see examples of what to look for: the shape of the letters, the quality of the leather, the internal tags, and the stitching. This check helps you avoid mistakes when shopping online and understand whether the bag is worth its price.