based on https://www.geeksforgeeks.org/vi-editor-unix/ ================================ ESC to move to 'Command mode' : to move to 'Escape mode' iIoOaA to move to 'Insert mode' ================================ NAVIGATION k : Moves the cursor up one line. j : Moves the cursor down one line. h : Moves the cursor to the left one character position. l : Moves the cursor to the right one character position. 0 or | : Positions cursor at beginning of line. $ : Positions cursor at end of line. W : Positions cursor to the next word. B : Positions cursor to previous word. ( : Positions cursor to beginning of current sentence. ) : Positions cursor to beginning of next sentence. H : Move to top of screen. nH : Moves to nth line from the top of the screen. M : Move to middle of screen. L : Move to bottom of screen. ================================= ENTERING AND REPLACING TEXT i : Inserts text before current cursor location. I : Inserts text at beginning of current line. a : Inserts text after current cursor location. A : Inserts text at end of current line. o : Creates a new line for text entry below cursor location. O : Creates a new line for text entry above cursor location. r : Replace single character under the cursor with the next character typed. R : Replaces text from the cursor to right. s : Replaces single character under the cursor with any number of characters. S :Replaces entire line. ================================= DELETING x : Deletes the character under the cursor location. X : Deletes the character before the cursor location. Dd : Deletes the line the cursor is on. ================================= COPY & PASTE Yy : Copies the current line. 9yy : Yank current line and 9 lines below. p : Puts the copied text after the cursor. P : Puts the yanked text before the cursor. ================================= ESCAPE MODE q : Quit q! : Quit without saving changes i.e. discard changes. wq : Write and quit (save and exit). w fileName : Write to file called fileName (save as).