Where QR codes actually earn their keep
A QR code is the cheapest bridge between your printed material and a web destination you control. Put one on a business card linking to your LinkedIn, on a restaurant table linking to a digital menu, on product packaging linking to setup instructions, or on an event badge linking to a vCard. Because the code only points to a URL, you can change what lives at that URL anytime without reprinting a single thing. Export at 600px for print so it stays crisp at any size.