DNS for rocket scientist
https://www.zytrax.com/books/dns/

Only around 180 page

is switching to BSD worth it? what are the pros and cons? Diff bwt FREE , OPEN, and NETBSD?

https://lnag.sourceforge.net/downloads/LinuxNewbieAdministratorGuide.pdf
only 45 page

Nice guide on Linux security
https://www.linuxtopia.org/LinuxSecurity/LinuxSecurity_Introduction1.html

For networking, firewalls etc

>be me
>Jack of all trade
>Having an interview today
>At station
>The company is 3.7km away
>Uber , nah let's walk
>Took 1 hour to reach there
>See humans there, got panic
>Everyone was studying
>Don't want to increase my cortisol
>Anxiety on peak
>Just wanna go home