Zoom Tool Shortcut

Rather than moving all the way over to the Toolbox to click on the Zoom tool, press Command-Spacebar (PC: Control-Spacebar). This will interrupt whatever tool you are using and activate the Zoom tool. Click to zoom in, and then release the keys to return to whatever tool you were using. To zoom out, add the Option key (PC: Alt key), making the shortcut Command-Option-Spacebar (PC: Control-Alt-Spacebar).