GamerCore
Android Enthusiast
Scanning a QR code on the Moto G5 Plus, is easy because it's built into the stock camera app. Just open the camera app and point it at a QR code you'd like to scan.
The camera app will automatically identify the QR and showing the info on screen. If it's a link, you can either following the link using the Chrome browser, or copy the info by tapping the appropriate copy icon.