Concrete walkthroughs for the places QR codes and bio pages actually get used — packaging, business cards, event badges, vehicle signage, print ads, and creator profiles.
A QR code on a shipping box and a QR code on a conference badge are the same technology solving completely different problems. The box code has to survive being printed at low resolution on brown cardboard, needs to still work two years after the product shipped, and is usually scanned by someone standing in their kitchen trying to figure out how the thing works. The badge code is scanned hundreds of times in a single day by a staff member holding a scanner, and becomes worthless the moment the event ends.
Each guide below is built around one of those situations. They cover the practical decisions the generic advice skips: print size and contrast for the surface involved, whether the destination will need to change later, what to do about people who will not scan, and which numbers tell you whether it worked. Where the destination needs to change after printing, that decision comes back to choosing a dynamic code.
The link-in-bio guides work the same way. A musician's bio page, a coach's, and a real estate agent's share a layout and almost nothing else — the musician is routing people to streaming platforms and tour dates, the coach to a booking calendar and proof, the agent to individual listings that turn over constantly. If you want the same material grouped by trade instead, see the industry guides, and for the definitions behind any of it, the glossary.
Scan counts on their own answer almost nothing. A packaging code with two hundred scans in a month is doing well if you shipped three hundred units and doing badly if you shipped fifty thousand. The useful comparison is always against a denominator you already know — units shipped, cards handed out, attendees checked in, flyers mailed — and against the same code in an earlier period rather than against someone else's benchmark.
Where a single piece of print carries more than one destination, giving each its own link is what makes the numbers readable afterwards. Adding UTM parameters to those links keeps the traffic identifiable once it lands in your analytics, so a print campaign stops showing up as anonymous direct traffic. The how-to guides cover the tagging setup end to end.