Save read-only edited in vi/vim

w !sudo tee %
What the command does:
:w = Write a file.
!sudo = Call shell sudo command.
tee = The output of the vi/vim write command is redirected using tee.
% = Triggers the use of the current filename.
Simply put, the ‘tee’ command is run as sudo and follows the vi/vim command on the current filename given.

Navigating in vim

• ctrl u and ctrl d to scroll up & down.
• G goes to the last line.
• gg goes to the first line.
• %, which moves to the next or previous related item.
• Move to the end of the next word, use e. The opposite is b

Delete till next character

:d]}

Here d means delete, ] till you find next character which is }