QR code scanning

Don’t worry about technique, just do the exercise the best you can. Get a QR code scanner, or there’s a QR app for smart phones that you can download and use. Then, go online, and generate a QR code, and copy and paste it on Microsoft paint or any sort of software like that. Place many QR code on that platform. Do place it on various location. Train only your left hand to scan QR code. Or, you can print out as many QR code on paper, and tape it on a surface and scan it, in any formation you like. Keep doing this exercise with only your left hand, until it feels tired

The QR code generator.
https://www.qr-code-generator.com/

The free internet paint program.
https://jspaint.app/#local:dfd7318d7dfdf

The QR code app for smart phone.
https://play.google.com/store/apps/details?id=me.scan.android.scan

Use your phone to scan QR code on screen or on paper.