Need a word's definition? Just type it into Google, preceded by the string "define:" and Google will look it up on dictionary.com, which also has an audio clip showing how to pronounce it. That's among the tips in this large graphic from hackcollege.com. Also included are tips for searching Google Scholar, as well as some common keyboard shortcuts for zooming in and out, cycling through windows and applications, and making screenshots of the whole screen or a part.
