Go h*ck yourself:online reconnaissance (online reconnaissance)

Advanced search techniques ：

For example, the operator ext: searches for specific file extensions, or the filename endings for different types of files. Examples include docx for Microsoft Word documents, txt for plaintext, pdf for PDF files, xlsx for Microsoft Excel spreadsheets, and so on. The operator site:searches for results on specific sites; you might search for site:nostarch.com or site:yourcompany.com.

Finding Passwords with the ext: Operator

type ext:xls password

Recommend a website ：

VirusTotal - Homehttps://www.virustotal.com/gui/home/upload

Analyze suspicious files, domains, IPs and URLs to detect malware and other breaches, automatically share them with the security community

Google Hacking Database

Google Hacking Database (GHDB) - Google Dorks, OSINT, Recon (exploit-db.com)https://www.exploit-db.com/google-hacking-database