Some commands for vim

1. delete a whole line: dd
2. copy a line: yy
3. paste: p
4. copy a few lines: shift+v + y
5. copy a few words: v + y
6. undo: u
7. redo: control+r
8. replace A with B: :%s,A,B,g
9. add a word in the beginning of each line: ctrl+v + shift+i + "words" + esc
10. exit with saving: :wq
11. exit without saving: :q!
12. to the top line: gg
13. to the end line: shift+g
14. search a word: /"word" + enter
1. next: n
2. previous: shift+n
15. to line 100: 100 + shift+g
16. to the first of the line: 0
17. to the end of the line: $
18. enter replace mode: shift+r
19. delete all lines: Esc+gg+dG