QR codes are a great way to display information on the go. They provide just enough info to get you started and can definitely help out in some scenarios when you don't have much time. Here are some of the most common encoding schemes you may come across: Text, E-mail, Wifi, Location, Phone, SMS, V-card, WhatsApp, Skype, Zoom, Event, PayPal, and BitCoin...
These journals allow for unlimited editing & revision but this usually just means that there are more chances to find errors like typos. Be sure to always test these before printing and considering your purchase.