Where Online Learning is simpler!

The output of your command "netstat -an | grep LISTEN | grep 80" is:

tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN     
unix  2      [ ACC ]     STREAM     LISTENING     7480     /run/systemd/journal/io.systemd.journal
unix  2      [ ACC ]     STREAM     LISTENING     21801    /run/user/1000/snapd-session-agent.socket
unix  2      [ ACC ]     STREAM     LISTENING     21803    /run/user/1000/speech-dispatcher/speechd.sock
unix  2      [ ACC ]     STREAM     LISTENING     21980    /run/user/1000/at-spi/bus