To turn updates on or off, follow these steps:
Open Google Play.
Tap the hamburger icon (three horizontal lines) on the top-left.
Tap Auto-update apps.
To disable automatic app updates, select Do not auto-update apps.
If you want to instead auto-update apps only when you're connected to a WiFi network, tap Auto-update apps over Wi-Fi only in the same pop-up.
Android also lets you choose which apps you want to update automatically.
To turn on auto-update for any app, go to the app page in the Google Play app.
Tap the three vertical dots in the top right.
This way, you can disable automatic updates and still keep chosen apps ready with the latest versions.