Here is a video tutorial for using QR codes:
Here is a annotated screenshot of a QR Code making website:
This is a sample of a QR code. Once you make it it can be printed out or saved on your computer or device. Try scanning it! It will link to this website, where you can make your own QR code!
Here is what one app that you can download to read and scan QR codes looks like:
Now that you have learned about QR codes you can go and try one yourself!