Virtual Private Networks and Tunneling
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-Please have a look at http://www.robinkrens.nl/tunneling.html
+Please have a look at <URL:./tunneling.html:tunneling.html>
Cheatsheets
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Here are some good cheatsheets for commonly used tools
* VI(M) - https://vim.rtorr.com
-* GIT / GITHUB - http://www.robinkrens.nl/cheatsheets/git.pdf
+* <URL:./files/git.pdf:GIT and GITHUB>