Installing and updating apps

In short: You get apps from the official store (Google Play or App Store). Check the provider and reviews and allow only necessary permissions.

In more detail: The store checks apps, but fakes exist there too. An app may only access camera, location or contacts if you allow it.

In Depth

Installing: Open the store → search → “Install”.
Permissions: Check access. A flashlight app without contacts access!
Updating: Updates in the store or automatically over Wi-Fi.
Uninstalling: Long-press the app → Uninstall, or Settings → Apps.
Costs: Watch for in-app purchases and subscriptions. Cancel trial subscriptions in time.
Other sources: Apps from unknown sources (APK files) only if you know exactly what you are doing.
Storage: Remove unused apps.