Ray, some browsers have barcode generators built-in to make exchange of links easier. QR-Codes have been a thing in the UK for Covid-19 venues. Useful for What Three Words signposts. Savvy organisations use them to rack success points...
Acorn
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:-O Great. Cool. Enjoy. ;))
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The one thing you should do with any QR-Code scanning with your phone is to not allow automatic following.
That why, I can avoid Jeff's YouTubing above but more seriously decide if the link is going to be malicious or even a tracking one.
As an end-user, I find ISBN scanning is great for when I'm selling books so I get the right edition and its details.
Acorn