Go off the record if you don't want your conversation archived
Did you know every conversation you've ever had on Gchat is archived and easily accessible? Well, you do now! To take a walk down memory lane, tap More from the left-side Inbox menu, select Chat, and scroll through your sordid history of smalltalk. Of course, you can go off the record if you want. Open a chat window with the person in question, click the settings cog wheel, uncheck Hangout history, and speak freely (just remember, if the other person hasn’t done this there’s still a record of what you’re saying somewhere).
Change font settings on the fly
Your witty quips and vicious scoldings don’t have the same impact if you’re not crystal clear how what you’re writing should be interpreted, so here are some stylization hot tips: on a Mac, to activate bold, italics, or underlining press Command + b, Command + i, or Command + u, respectively. On a PC, it's Ctrl + b, Ctrl + i, and Ctrl + u. Know them, love them, live them. Just keep in mind that you must type the command again in order to turn the formatting off.
Play around with Easter eggs
Like every good Google product, Gchat has its fair share of hidden Easter egg features. They're more fun and weird than useful, but worth exploring nonetheless. Here’s a pretty solid list to get you started.