some advance tips in using vim

1.we can use :set command to set the env for input
for example:
    set ai (autoindent) makes the next line's first char head with the pre line's char
    set nu   show the number of the line
   
    we also can use :set all to see all then env

2.we can use ab(abbreviation) for some abbreviation while inputing the text
for example:
    :ab uno Unix Operating System
next time when we enter "uno" which separated by the space ,_uno_ automatically change to "Unix Operating System"

    we can use unab to cancel it:     : unab uno
 To see all the defined abbreviation,use  :ab [return ]

3.we use map command to map one key to present the command contributed by some keys

Here is the example: man q 5dd   so when we in the command mode ,if we press "p" we actually equal pressed "5dd",so we got 5lines delete form our text

use unmap p to cancel this map

tips:Only a few key can be map to this command like K V q [ctrl-e] and [ctrl -x]

we also can use #n (n is a number between 1-12) for Fn to map the command.