As well as obvious things like a protective case, you can take steps to make sure your device is safe by following a few simple tipss
When downloading apps, go directly to a legitimate source
For example use the official App store or the Play store and be cautious when downloading apps accessed by clicking on a link
Remotely wipe your smart phone or tablet if it’s lost or stolen.
This will prevent sensitive information from falling into the wrong hands
Secure access to your device
Use a strong PIN, password, passcode or fingerprint detection to access your device
Clear all information on your device before selling it