Default Root Samsung grand 2

Is this process of rooting safe if I do it correctly or there is also chance of bricking ?Idon't want to lose warranty so please give me some tips. If i root my device can i use my sd card as my default installation of apps or I need to install custom rom? If i root my device is it in stock rom? SOrry for my many questions. newbie on android from ios.
Instruction:
1- Download CF-ROOT for device SM-G7102 from THIS LINK
2- Extract the downloaded files in ur PC and connect ur fone in download mode (volume - , Home button , Power button press simultaneously for some seconds)
3- Open ODIN and place CF-Auto-Root-ms013g-ms013gxx-smg7102.tar.md5 in PDA or AP section of ODIN
4 - Press start button on ODIN and wait till it shows RESET or PASS and fone Reboot automatically
5 - Enjoy ur Root on Grand 2