Quick settings

With Quick Settings, you can add/remove third-party tiles within the Quick Settings section of the notification shade. Each tile will do something different, depending upon what the third-party developer has allowed, but they make for an incredibly efficient means to gain access to app features (such as Spotify Offline Mode, VPN on/off, and more). What tiles you have available will depend upon what third-party apps you've added. But to add them to your notification shade, do the following:

Pull down the notification shade twice
Tap the pencil icon in the top right
Scroll down to locate the tile you want to add (Figure F)
Drag the tile to the top portion of the shade to the location you want
Tap the back button when finished
Figure F

You know you can open the app list and scroll through your recents apps to bring up a recently used app. But did you know you can easily switch between your last two apps by double-tapping the overview button? That's right. With an app open, double-tap the overview button (the square button at the bottom of your device) to bring up the last app used. If the app that appears isn't the one you want to switch between, you can always single tap the overview button and swipe away that app until the one you want appears. With that in place, you can now double-tap between the two apps you want to switch between.