If you’re like one of the other 6.5 billion people around the world who own a smartphone, it couldn’t be any easier to scan a QR code!
There are countless QR code readers/scanners available on both the App Store and Google Play Store - just search ‘QR code reader’ and download the one you want.
Then open the app, wait for the camera to begin operating and hold it up to the QR code you want to scan. That should either cause the action to occur automatically or display a link/phone number/et cetera which you can click on to perform the action manually.