Some vim tips

$ → Go to the end of the line

H → Go to the 1st line of the script (H is for Head)

L or G → Go to the last line of the script (L is for Last)

A → Appends after the last letter of the current line

a → Appends after the cursor

i → Insert at the current cursor position

r → Replaces the current character by the one you will type after the r

R → Insert mode but for replacing current characters instead of adding new until the Escape key is pressed

o → Opens a new line below the current in insert mode

O → Opens a new line above the current in insert mode

dd → Deletes current line

d5d → Delets the next 5 lines including current

x → Deletes character under the cursor

D → Deletes characters from the cursor to the end of the line

C → Deletes characters from the cursor to the end of the line and switch to insert mode (C is for Change)

yy → Copies the current line (Y is for Yanks)

y6y → Copies the next 5 lines including the current one

p → Pastes the yanked lines

^ → Moves to the 1st non-blank column of the current line

% → Moves to associated (), {}, []

w or W→ Goes to the next word

wd → Deletes the current word starting from cursor position

wc → Changes current word (like a wd and a i combination)

m + a char → sets a mark

y' + a marked char → Copies lines from the current position to the given mark (eg: me move to another position and do a y'e to copy the current block)

d' + a marked char → deletes lines from the current position to the mark

u → Undoes the last action

U → Undoes all commands on one line

Ctrl + r → Redo the last undone action

J → Joins the current line and the next one including a space between them and setting cursor position to the joining point

:3 → Goes to the 3rd line

gUw → Converts a word to upper case

guw → Converts a word to lower case

VU → Converts current line to upper case

Vu → Converts current line to lower case

V~ → Inverts the case of the current line

/ → Searches forward in the document

? → Searches backward in the document

:set list → Prints escape characters (end of lines, etc.)

:set nu → Prints line numbers as 1st column

:set sm → Show matching { or ( as ) or } is typed

:!'cmd' → Executes cmd command in a shell prompt

:r filename → Copies (reads) filename contents after cursor in the current document

:3,15w filename → Saves lines 3 to 15 to filename

:3,15w >> filename → Appends lines 3 to 15 to the end of filename

:e → Discards all unsaved changes and continue editing

:.= → Shows current line number

:= → Shows number of lines in file

Ctrl + v → Enters visual block mode