Soft resets are usually conducted in an attempt to fix malfunctioning applications or because they're required for software installation. Soft reset contrasts with hard reset, which removes all user data, settings and applications and returns a device to the same state it was in when it shipped from the factory.
1. Let's begin from unlocking your screen and holding down power button.
2. Once you will see this menu, you can release the power button.
3. Now choose Reboot or Reset option by tapping on it.
4. And this is it, your device will restart now.
Sometimes your phone is not responding due to some application or other problem, in this situation you can reboot your phone.
If you want to erase your all data from your phone then you should go with factory setting restore.
This option will erase your all data.
The main reason to power them down daily would be to not waste energy.
Along side that it allows your RAM to flush itself as well as "rest" when fully off, this gives the RAM some extra longevity.
Diagnostics are often ran during the time of booting, so small errors are often automatically fixed.
And of course the obvious reason; for updates requiring reboots.