How to scan Coinbase QR code?

Excuse me, could you please explain to me how I can go about scanning a Coinbase QR code? I've heard that it's a quick and secure way to transfer cryptocurrency, but I'm not entirely sure how to proceed. Could you walk me through the steps, perhaps starting from the Coinbase app itself? It would be greatly appreciated if you could also highlight any potential pitfalls or security concerns I should be aware of when scanning QR codes. Thank you in advance for your help.