Nginx and UFW

https://www.digitalocean.com/community/tutorials/how-to-install-nginx-on-ubuntu-16-04

https://help.ubuntu.com/community/UFW

https://www.digitalocean.com/community/tutorials/how-to-set-up-nginx-server-blocks-virtual-hosts-on-ubuntu-16-04

Linux and Modem

http://www.monblocnotes.com/node/1920

Tracert and visual Tracert

http://www.candra.web.id/kupas-tuntas-perintah-tracert/

Tutorial Nmap

http://www.candra.web.id/tutorial-nmap/

Wireshark Setup For Kali Linux

https://ask.wireshark.org/questions/7976/wireshark-setup-linux-for-nonroot-user

Install Remote Desktop Server at Kali Linux

https://msitpros.com/?p=3209

Install other desktop manager in Kali Linux

https://forums.kali.org/showthread.php?17716-How-to-install-remove-different-Desktop-Window-Manager-in-Kali-Linux-1-x

Struggling with variables at bash programming

Mind the space between equals

http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-5.html

Install latest postgresql via apt-get

https://www.digitalocean.com/community/tutorials/how-to-install-and-use-postgresql-on-ubuntu-16-04