How to update all Android apps automatically

Open the Google Play Store app Google Play.
At the top right, tap the profile icon.
Tap Settings and then Network Preferences and then Auto-update apps.
Select an option:
Over any network to update apps using either Wi-Fi or mobile data.
Over Wi-Fi only to update apps only when connected to Wi-Fi.

Note: If an account on your device has a sign-in error, apps may not update automatically.