After the install, if you are running on Linux, you can execute the "/etc/init.d/nessusd start" command; this tool is accessed through the browser at https://127.0.0.1:8834 and then is entered the user account activated during the installation process.

Once in the main interface of Nessus, you must enter the user's access data. Then, you must access the Scans tab, which can be seen in the image and the option of Basic Network Scan is selected:

When this selection is made, the interface is opened where the scanner's objective must be established, be it a computer or a network, the scanner's policy and a name to be able to identify it. Once this data has been selected, the scanner is started and, once it is finished, we can see the result by selecting the analysis from the Scan tab.

In the Scans tab, the objective to be scanned is added, and the process is executed. With the use of this tool, together with the search in the specialized databases, the different vulnerabilities present in the system to be attacked are obtained, which allows us to advance to the next phase: exploitation.