How can I make my phone's battery last longer?

You do not need to charge it always and leave it until it empty the battery and charge it to have a long lasting battery charge.

To give a better and longer standup time. Turn off your mobile data and use only when it is needed. It has a major effect on the battery timing.

Use Low brightness. Keep on closing the applications immediately after use. Turn off the data and wifi connections when you really not require it. Use ring tones only instead of using vibration modes. while battery is about finish use low power mode. 

On phone settings, disable mobile data, bluetooth, reduce screen brightness, reduce sound volume, and use the power-saver mode in your phone so it will only use lesser amount of power. 

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by closing the unwanted/unused apps

you need to charge it alwayse and decrease the use of mobil data

The best way to make your phone battery last longer is by putting it in Lemon & Salt.

Dim the screen brightness or use auto brightness

Keep the screen timeout short

Turn off Bluetooth

Turn off Wi-Fi

Go easy on the location services, and GPS

Don't leave apps running in the background

Don't use vibrate

Turn off non-essential notifications

Enable a battery-saving mode

As far as I know, first thing to consider if you want your phone's battery to last longer is responsible charging process. A good example of this is not using your phone while charging. Another thing is do not overcharged your phone and turn off unused running apps and your phone's data, this will help a lot to make your phone's battery last longer.