robinkrens.nl - Linux Resources
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This page lists some useful resources for a more in depth understanding on specific subjects. Assumed is that you have a basic understanding of Linux and Networking. If not, you might to start with one of the followings books

	* http://linux-training.be - PDFs about the fundamentals, gives an overview of the most common tools and how to use them. PDFs contains some nice exercises.
	* http://www.tlpd.org - The Linux Documentation project. Look for the UNIX and Internet Fundamentals HOWTO. (Do you *really* know what happens when you turn on a PC?) 


Networking
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A good way to understand more about networking is two setup two computers: a server and a client. And the play around with the tools. The following tools and documentation are extremely useful 

Iptables
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Although there is more abstract software to manage firewalls, like *ufw* on debian-based systems and *firewall-cmd* on redhat systems, Iptables will help you understand what actually happens during filtering, mangling or routing a package. https://www.frozentux.net/iptables-tutorial/iptables-tutorial.html has a structured approach in explaining _what happends when a package hits the firewall_.

Virtual Private Networks
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Please have a look at http://www.robinkrens.nl/gfw.html

Cheatsheets
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Here are some good cheatsheets for commonly used tools

* VI(M) - https://vim.rtorr.com
* GIT / GITHUB -