Scanning a QR code is incredibly easy and usually doesn't require downloading any extra apps. Most modern smartphones have built-in QR scanners inside their camera software.
Open the built-in Camera app on your iPhone. Point the camera steadily at the QR code. A yellow notification link will instantly pop up on your screen. Tap the notification to open the link.
Open your built-in Camera app. If your camera supports auto-detection, it will show a link immediately. If not, open **Google Lens** (the small colorful square icon in your search bar or camera), point it at the QR code, and tap the link.
If you have an older phone, you can download any highly-rated, free QR Code Scanner app from the Google Play Store or App Store.