A touchpoint can be wireless (Eddystone-URL Beacon), visual (QR Code) or tactile (NFC Tag). You can view these as different ways for your users can access information
Two things to think about when determining the number of Touchpoints.
1. How do you want to engage with your customers?
2. What pieces of content do you want to provide?
You can learn more about Touchpoint Browsing here.