This document discusses cyber security and provides tips to stay safe online. It introduces Mohammad Yahya as an expert in security research and ethical hacking. It then defines computer security and hackers. Major cyber attacks are listed that resulted in stolen records and revenue losses. Statistics on cyber crime in India show a high rate of vulnerabilities in mobile apps and websites. The document recommends securing applications and identities by using trusted sources for operating systems, web browsers, and software. It also promotes the use of encryption, VPNs, and secure communication apps to enhance online safety.