VIM notes

dw: delete current word, but first thing for this command is the cursor has to be the first character of the word.
d$: delete to the end of the line
0: move to the end of the line.
d3w: delete the 3 words after the cursor. d4w will delete 4 words
U: To undo all the changes on a line
p: put the line which deleted by command 'dd' under the cursor line
r: Type  rx  to replace the character at the cursor with  x
ce: To change until the end of a word, type  ce
c$: Delete the context from cursor to the end of the line, and go the input mode
ctrl+g : To show your location in the file and the file status.
G: Go to the bottom of the file.
gg: To move you to the start of the file.
G: Type the number of the line you want to go and then G, this will go to the line you wann to go.

/: search for the phrase from forward
?: search for the phrase from backward
n: search the same phrase again, simple type n
N: search the same phrase in the opposite direction, type N
ctrl+o: To go back to where you came from. Repeat to go back further
ctrl+i: To go forward
%: to find a matching ),], or }. This is very useful in debugging a program with unmatched parentheses
:s/old/new/  to substitute 'new' for 'old', only change the first occurrence
:s/old/new/g to substitute 'new' for 'old', will change all the occurrences in the line
:%s/old/new/g to change every occurrence in the whole file
:%s/old/new/gc to find every occurrence in the whole file, with a prompt whether to substitute or not
o: to open a line below the cursor and place you in insert mode.
O: to open a line above the cursor and place you in insert mode.
a: to insert text AFTER the cursor
i: to insert text BEFORE the cursor
A: to insert text at the end of line
R: replace more than one character
r: replace one character of cursor position

copy and paste:
1. start visual mode with v and move the cursor to select the text you want to copy
2. Type y to yank(copy) the highlighted text.
3. Go to the position which you want to paste your text
4. Type p to put(paste) the tex