VIM fundamental

What is VIM? is VI iMprovement , and advanced of VIM.
Whenever you jump into Linux or Unix-like environment , Hence if you need to manipulate as coding/ configure with any text file (that contain the ASCII character ) with any extension like conf, xml, c, cpp....
VIM has 2 modes: Command(esc)/Insert(i)/Visual(v)
Following are some basic manupilations:

1. :help to open Help page.
2. Navigate:  using 'h-j-k-l' for 'left-down-up-right'
3. :q -Quit
4. :q! -Quit without saving  
5. :set mouse=a Set mouse as in GUI editer   
6. d  Delete one character:   
7. dd -Delete a row:   
8. y -copy
9. yy -copy a line
10. U: undo last change
11. set number ->set line number
12. set nonumber
13. :rs/foo/bar/a Substitute foo with bar. r determines the range and a determines the arguments. (r=nothing : current line , r=number at the line,r=% whole file)

Update more later