Open the App Store
Tap your profile icon in the top right corner
Scroll to see available updates
Tap Update next to an app
Tap Update All to update every app at once
Wait for the updates to finish
Make sure your iPhone is connected to Wi-Fi or has enough cellular data
Make sure you are signed in with your Apple ID
Turn on automatic app updates in Settings if desired
Open Settings
Tap App Store
Turn on App Updates under Automatic Downloads