What is root?
In clear words, rooting means to give applications full access of your phone which the manufacturers do not provide. By gaining root access you can modify the device's software on the very deepest level.
Advantage of rooting
NOTE; Many manufacturers note that how many times you have rooted or installed custom roms, so rooting will void your warranty, but it can b brought back.
Pre requisite

http://im.tech2.in.com/gallery/2013/may/enableudbdebugm...
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Lets begin
NOTE:Note: If the Added message does not appear then try another USB port, try the one located at the back side of the computer. In case Odin still fails to recognise the device then reinstall USB driver

As the Galaxy Note 2 boots up, it should be rooted successfully on Android 4.3 firmware. You may install any app that requires root permission. To verify the root status of the device download Root Checker app from Google Play Store.
Note:
Sometimes the device does not boot into Recovery Mode and root the device. If this happens then perform the entire procedure again. If it still does not install root, ensure Auto Reboot checkbox in Odin is not checked. Then after flashing the root package, pull out the battery and boot the phone into Recovery mode by selecting Volume Up, Home and Power buttons together. This will start the install process.
Above method will root you phone. But if you wish to install custom roms and mods, you need to install a custom recovery. Below we will learn hwo to flash cutom recovery.
1) Download this file from here. CWM
2)You do not need to unzip this downloaded file as it is already in .tar.md5 format.
3)Open Odin.
4)Put your phone in download mode and connect it to your computer using the data cable, the ID:COM box should turn now as shown and explained above.
5)Click on PDA tab and select the downloaded .tar.md5 file.
6)Click Start, the process will start and give you a PASS indication above the ID:COM box if it installed the recovery successfully!
Hence you are ready to mod! Good luck
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