The MSF is an open-source tool, which provides a framework for security researchers to develop exploits, payloads, payload encoders, and tools for reconnaissance and other security testing purposes. Metasploit is a hacker's best friend, mainly cause it makes the job of exploitation and post-exploitation a lot easier compared to other traditional methods of hacking
The video shows you how to use metasploit
For more information on using the metasploit, you download and read the book which explains in detailed on using the metasploit.
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MSF_final.pdf