How to install TWRP custom recovery in any android devices (without root) | Easy and simple method

Hey guys,
Here are many ways to flash TWRP in your device, but they may not work in some devices.
I classified it in two methods.

FIRST  METHOD :
Flash TWRP/CWM with flashify.
This method is only iuseful in rooted phones, or may not work if flashify failed to find your recovery.

SECOND METHOD : (without root)
This method gives 100% guarantee to install custom recovery in your phone without root and without brick your phone. TWRP stand for Teamwin recovery project.
bout first of all please make sure you take back up of your phone for safety.

You may also take refer from this video (in detail) and also see steps below this video.

Now Start to flash recovery :

1. Enable Developer option, for this go to about phone press build number 7 times and you will see that developer option is enabled.
2. Open developer option and enable ADB debugging.
3. Now whole work in pc :
1. go to C Drive where you install adb and fastboot files also paste twrp image file here.
2. now open command prompt, for this you have to press left shift + right click of the mouse and then click on open command window.
3. type adb devices and press enter.
4.  adb reboot bootloader and press enter by this your connected device is in fastboot mode.
5. type fastboot  flash recovery and type the name your recovery image file. 
6. type fastboot reboot and press enter.
4. Open developer option and enable Advance Reboot.
5. Now press power button >restart > recovery > press OK.
6. Now you are in TWRP/CWM cutom recovery