Zoom in and out in InDesign

Switching between the tools in InDesign can make you lose valuable time and make your arm hurt! My left hand is always on my keyboard, so I use my modifier keys to switch between my tools. 

Hold Command and Spacebar (mac) | CTRL and Spacebar (win) while you’re on any tool. The zoom tool will be temporarily active. Use the tool by either a single click or a click and drag around the area you want to see closer. 
Release your keys on the keyboard and you’ll return to the tool you were previously on. 
Keyboard Shortcuts:

Command and the “+” key | CTRL and the “+” key – will zoom into the selected item in both InDesign and Illustrator (2017)

Command and the “-” key | CTRL and the “-” key  – will zoom out 

Command and the “0” key | CTRL and the “0” key – will fit the page into the window (don’t use the “0″ key on the numeric keypad.)

Command, Option and the “0” key | CTRL, Alt and the “0” key – will fit the spread (InDesign) or all the art boards (Illustrator) in the window. 
Happy Zooming!