https://www.thebalancecareers.com/learn-javascript-online-2071405
https://www.learn-js.org/en/Variables_and_Types
https://www.learn-js.org/en/Pop-up_Boxes
https://stackoverflow.com/questions/17907455/how-to-get-numeric-value-from-a-prompt-box
https://www.w3schools.com/js/js_output.asp
https://www.w3schools.com/js/tryit.asp?filename=tryjs_output_dom
https://developer.mozilla.org/en-US/docs/Games/Tutorials/2D_Breakout_game_pure_JavaScript
https://idearocketanimation.com/14835-animated-gifs/
https://makeymakey.com/pages/educators#
sudo apt install exfat-fuse exfat-utils
go to /etc/apache2/ipblacklist.conf and use root to add the ip address of site to be blocked
use sudo systemctl stop/start to reload apache2
sudo iptables -A INPUT -s 0.0.0.0 -j DROP (replace zeros with real world ip address)
To safe this configuration and have it loaded after next reboot enter: sudo apt-get install iptables-persistent
Subsequently additional blocked ip address can be saved with these commands
sudo netfilter-persistent save
and sudo netfilter-persistent reload
If you get sick of typing sudo, simply type "sudo su" once, and the terminal will then become root
http://blog.turbine51.net/blog/2018/08/30/detnsw-ubutu-wifi.html
https://www.ostechnix.com/how-to-configure-ip-address-in-ubuntu-18-04-lts/
https://kifarunix.com/how-to-set-system-wide-proxy-in-ubuntu-18-04/
http://yasshighbyod.weebly.com/uploads/2/6/4/8/26481244/instructionsforandroid.pdf