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 If you want to Root Samsung Galaxy J2 SM-J200, you can try using Tool RootGenius, iRoot, KingoRoot, OneClickRoot, MobileGo or SRSRoot. Some tools are indeed made to gain root access on Android devices.

  But if you want to Root Android Without a PC, you can use the application RootGenius Mobile, iRoot Mobile, KingRoot Mobile, 360Root Mobile, Key Master Root, TowelRoot, or FramaRoot. These applications are made specifically for rooting on android devices.

Okay, now just at the discussion, namely Install TWRP Samsung Galaxy J2 SM-J200, Follow the steps as below.

Preparation:

Smartphone must have at least 30-40 percent of the battery to make the process of rooting

On your Samsung Galaxy, Enable USB Debugging Mode and OEM Unlock.

Download and install the Samsung USB driver on your computer.

Download and extract the file Odin Downloader

Download file TWRP Samsung Galaxy J2 SM-J200

Once you have downloaded all the files above, now turn off your Smartphone

After turning off, you need to boot into Download Mode, to boot into Download Mode press and hold the "Volume Down + Home + Power" together to Download Mode is active.

After you connect the smartphone to a computer, Odin will automatically recognize device and message "Added"

Once the device is detected by Odin, click on the button "AP" and select the file twrp-2.8.7.0-j2lte.img.tar

Now, click on the "Start" button in Odin to start Flahing, Flashing usually takes 30-50 seconds to complete the process of flashing the Samsung Galaxy J2 SM-J200. Once the flashing process in completed you will be able to see a green box with the words "Pass" in Odin. During this process the Smartphone will automatically re-boot