This guide introduces some commonly used search engines by hackers and emphasizes the importance of knowledge for being well-prepared in hacking.Specialized hacker search engines like Shodan, Censys, and others are crucial for uncovering hidden data and vulnerabilities.Shodan indexes devices like routers, webcams, and IoT devices to identify misconfigurations and default credentials.Censys is beneficial for finding expired SSL certificates and subdomains, aiding security researchers and bug bounty hunters.Wigle focuses on Wi-Fi network data and is useful for locating weakly encrypted networks and analyzing network density.Hunter.io reveals email addresses associated with domains, aiding in social engineering and phishing simulations.Vulners provides real-time vulnerability data for penetration testers seeking known vulnerabilities and exploits.LeakIX detects exposed databases and services, making it valuable for attack surface management and threat intelligence.Various tools, including crt.sh, Intelligence X, and FullHunt, offer functionalities for SSL certificate search, OSINT, and attack surface discovery.SearchCode assists in finding hardcoded secrets in code repositories, enhancing software supply chain security.