It ' s useful just like knowing how thieves steal cars is useful for the cops to understand how to catch them . But nobody would ever hire a cop just based on this knowledge . Being a good cop is much , much more than that . That ' s why people are saying that OSCP and Pentesting is such a circle jerk . It ' s not that it ' s not useful , it ' s just that for the majority of security professionals , it ' s not as central as too many people make it sound . And most people shouldn ' t focus on that . Being a good security professional is much , much more than that . <| sep |> button . It ' s on the Mac keyboard , below the escape key . I don ' t know what that ' s for . Same with F 13 through F 19 . They don ' t seem to do anything except make the mouse cursor disappear .