Useful Shortcuts

There are dozens, if not hundreds, of keyboard shortcuts for InDesign. These are just a few. 

• Zoom In: Cmd/Ctrl +
• Zoom Out: Cmd/Ctrl -
• Maintain a straight line (or 90° angle) when using the line or pen tool: Hold shift while clicking
• Toggle between Normal (showing guides + frames) and Preview (clean) modes: W (this doesn't work if you're in a text box) 

View all default keyboard shortcuts on Adobe's InDesign User Guide.