The Galaxy S6’s Hardware Buttons

Samsung has reduced the number of hardware buttons on the Galaxy S6. There are only four: the power button, the volume button, the camera button, and the home button. Before you get started with your phone, orient yourself to make sure you’re looking at the correct side of the phone.
The gestures to the left or right of the phone assume a vertical orientation (meaning you’re not holding the phone sideways) and that you’re looking at the phone’s screen.
power button
The power button is on the right side of the phone, facing up when you hold it in a portrait orientation.
In addition to turning on the phone, pressing the power button puts the device to sleep if you hold it down for a moment while the phone is on.
Sleep mode locks the screen and suspends most running applications.
The phone automatically goes to sleep after about 30 seconds of inactivity to save power, but you may want to do this manually when you put your phone away. The Super AMOLED display on your Samsung Galaxy S6 is great, but it also uses a lot of power.
Do not confuse sleep mode with shutdown. Since the screen is the biggest user of power on your phone, making the screen blank saves battery life. The phone is still alert for any incoming calls; When someone calls, the screen lights up automatically.
Volume button(s)
Technically, there are two types of volume buttons: one to increase the volume and one to decrease it. Their locations appear here.

The Volume buttons control the volume of all the audio sources on the phone, including:
>>>The phone ringer for when a call comes in (ringtone)
>>>The “notifications” that occur only when you’re not talking on the phone, such as the optional ping that lets you know you’ve received a text or e-mail
>>>The phone headset when you’re talking on the phone

>>The volume from the digital music and video player (media)

The volume controls are aware of the context; they can tell which volume you’re changing. For example, if you’re listening to music, adjusting volume raises or lowers the music volume, but leaves the ringer and phone-earpiece volumes unchanged.

The Volume buttons are complementary to software settings you can make within the applications. For example, you can open the music-player software and turn up the volume on the appropriate screen. Then you can use the hardware buttons to turn down the volume, and you’ll see the volume setting on the screen go down.
Another option is to go to a settings screen and set the volume levels for each scenario. Here’s how to do that:
From the Home screen, press either Volume button.
You can press it either up or down. Doing so brings up the screen shown here.
The ringer volume pop-up.
The ringer volume pop-up.
If you press the volume up or down, the ring tone gets louder or softer. Hold off on this tweak for now, and go to the next step.
From this screen, tap the Settings icon.
The Settings icon looks like a gear. It’s to the right of the slider. Tapping it brings up the screen shown here.
The All Volume Settings pop-up.
The All Volume Settings pop-up.
From the screen shown, set the volume at the desired setting.
You can adjust the volume of any setting by placing your finger on the dot on the slider image. The dot will get bigger; you can slide it to the left to lower this particular volume setting or to the right to raise it.
The Home button
The biggest button on the phone is the Home button. It’s on the bottom of the front screen.
The Galaxy S6 Home button on the front.
The Galaxy S6 Home button on the front.
The Home button brings you back to the home screen from wherever you are in an application. If you’re working on applications and feel like you’re helplessly lost, don’t worry. Press the Home button, close your eyes, tap your heels together three times, and think to yourself, “There’s no place like home,” and you will be brought back to the Home screen.
You don’t really need to do all that other stuff after pressing the Home button. Just pressing the Home button does the trick.