Mobile
How to turn off and hide WhatsApp “last seen” on Android
How to disable WhatsApp read receipts (2 blue check marks) on Android
How to block someone on WhatsApp (and unblock) on Android
How to hide your status from someone on WhatsApp on Android
Other
How to disable picture-in-picture on a Samsung Galaxy (Android 8)
How to disable device security on a Samsung Galaxy (Android 7 and 8)
How to mute (hide) someone on Instagram without unfollowing them
How to disable Device Security in Smart Manager on a Samsung Galaxy (Android 5 and 6)