vim: visual editor improved

source: http://www.improgrammer.net/vim-cheat-sheet/
https://www.howtogeek.com/102468/a-beginners-guide-to-editing-text-files-with-vi/
source: http://www.improgrammer.net/vim-cheat-sheet/
https://www.howtogeek.com/102468/a-beginners-guide-to-editing-text-files-with-vi/