Basics/starting out

https://www.rawhex.com/2015/02/tech-skills-pentesters-need/

http://www2.ece.ohio-state.edu/computing/useful_commands.html

http://commandwindows.com/

http://www.secretgeek.net/powershell_beginner

http://www.yourownlinux.com/2013/09/chmod-basics-of-filesdirectories.html

http://linuxcommand.org/lts0070.php

http://www.penguintutor.com/linux/basic-network-reference

http://www.howtogeek.com/67469/the-beginners-guide-to-shell-scripting-the-basics/

http://blog.commandlinekungfu.com/p/index-of-tips-and-tricks.html

Linux privilege escalation

https://blog.g0tmi1k.com/2011/08/basic-linux-privilege-escalation/

http://www.rebootuser.com/?page_id=1721#.V7zCFa1Bazs

Windows privilege escalation

http://travisaltman.com/windows-privilege-escalation-via-weak-service-permissions/

http://www.fuzzysecurity.com/tutorials/16.html

http://it-ovid.blogspot.com/2012/02/windows-privilege-escalation.html

Course/exam reviews

Offensive Security’s PWB and OSCP — My Experience

Creating a home lab

Interesting blogs

Online CTF resources

Cheat sheets

Misc tips/tricks

http://www.slideshare.net/mubix/dirty-little-secrets-they-didnt-teach-you-in-pentest-class-v2

Cracking linux password with john the ripper – tutorial

Nmap Output Formatting

http://netsec.ws/?p=331

http://netsec.ws/?p=309

https://highon.coffee/blog/ssh-meterpreter-pivoting-techniques/

Books

https://github.com/vhf/free-programming-books/blob/master/free-programming-books.md#python

https://www.amazon.com/Violent-Python-Cookbook-Penetration-Engineers/dp/1597499579/ref=sr_1_1?ie=UTF8&qid=1471989090&sr=8-1&keywords=violent+python