Some Trivia and Useful Links I browse through frequently
http://lifehacker.com/5743814/become-a-command-line-ninja-with-these-time-saving-shortcuts
https://trailofbits.github.io/ctf/
https://backdoor.sdslabs.co/
https://web.stanford.edu/~adyuen/107 -> Mercurial, Valgrind, GDB, IA32
https://www.seas.upenn.edu/cets/answers/auth-htpasswd.html