Sometimes web pages are a little too big or too small and it would be nice to be able to zoom out or in to make the page easier to read. Fortunately, your browser has a few keyboard shortcuts to remedy those problems.
In order to zoom in, you just press Control (Windows) or Command (Mac) and the + key. (Technically you're pressing the = key because you'd need to press shift to make a plus, but thinking of it as the + key makes more sense since it's zooming you in.) To zoom out, press Control/Command -, and press Control/Command 0 to set things back to normal. This can be really handy on high-res screens, screens that are too far away, or sites that just make everything ridiculously big and you don't want to be scrolling everywhere just to navigate.
Shortcut of the Day highlights a great shortcut on various platforms from the desktop to mobile devices to the web. You can find more shortcuts here.