Only download apps from Google Play’s and Apple's stores
Not all the apps in the App Store or the Google Play store are 100% trustworthy, but you should only download from the official stores, rather than side-load an app. Apps available on these platforms will have been vetted to ensure that they meet a standard quality of data protection and will also be required to produce a dedicated privacy policy for you, telling you just how they protect your data. Downloading an app from unofficial or insecure sites increases the risk of ransomware, malware, spyware, and trojan viruses infecting your device. In the worst case scenario, a hacker could take full control of your device.