fn+M

Toggle between Insert and Overwrite mode.

Arrow Left

Move the cursor one character to the left

Arrow Right

Move the cursor one character to the right

Arrow Up

Move the cursor up one line

Arrow Down

Move the cursor down one line

fn+Arrow Up

Move the cursor up one page

fn+Arrow Down

Move the cursor down one page

Command+Arrow Left

Move the cursor to the beginning of the line

Command+Arrow Right

Move the cursor to the end of the line

Delete

Delete the character to the right of the cursor (or any selected text)

Shift+Enter

Insert newline including leading characters of the current line which are not letters or numbers.

Shift+Arrow Left

Mark text one character to the left

Shift+Arrow Right

Mark text one character to the right

F1

Help

Shift+F1

What's this?

Command+F

Find

F3

Find Next

Command+B

Set a Bookmark

Command+C

Copy the marked text to the clipboard

Command+N

New document

Command+P

Print

Command+Q

Quit - close active copy of editor

Command+R

Replace

Command+S

Save your file

Command+V

Paste

Command+X

Delete the marked text and copy it to the clipboard

Command+Z

Undo

Command+Shift+Z

Redo