Think before you click! Similar to reading email carefully, if someone sends you a link via online messaging or other service, review the link carefully before clicking. Some links may install malware or virus that may compromise your device security.
Be especially careful about links that contain or end in any of the following file formats: .php, .exe, and .xxx. These can contain what's known as "executable" files that can quickly deposit and install unwanted malware or virus software on your devices which search your computer to mine/extract protected data, including your sensitive information, passwords, computer files/documents and keystrokes, all of which can compromise your privacy and/or allow them to steal your identity. Think of it as "driving defensively" and avoiding accidents.