Power users know that, when you’re composing text, it’s often easier to move your cursor around (and potentially highlight chunks of text) using the keyboard, instead of moving your typing hand over to the mouse. Most Mac apps support something called Cocoa key bindings, a fancy term for system-wide keyboard shortcuts for navigating and working with text. Some are probably familiar to you, such as combining Command with the arrow keys to move the cursor within the current line or document (or Command-Shift-arrow to select text). There’s also Option-left arrow and Option-right arrow, which move the cursor through your text word by word. Others are less well-known: Control-A, for example, moves the cursor to the beginning of the current paragraph; Control-O splits the current line, inserting a return without moving the cursor to the new line; Control-T transposes the two letters on either side of the cursor.