It has to be used in rare circumstances, like when your device is unable to boot and got its partitions corrupted because of the flashing of wrong firmware or anything.

Use a PIT file very wisely when using Odin.

If not visible directly, then find it in the Options tab.

When you don’t need to restart the device right after flashing the firmware/root/TWRP - as you may need to reboot into recovery mode, or maybe flash another file in download mode - then uncheck the Auto Reboot box.

But be sure to use a full guide before installing TWRP, as some other stuff like custom kernel may also be required in some cases. You can find TWRP recovery for Samsung Galaxy devices here.

Although Odin is primarily used to install the firmware on Samsung’s Galaxy devices, it is also used a lot to root or install TWRP recovery on Samsung devices.

Keep in mind: Always download the latest version, as using the latest version of Odin will fix some of the issues automatically without you ever needing anything to fix such issues. (Like Galaxy S8/S9/Note 8 T-Mobile firmware on say, Sprint variant. Used when flashing a cross-compatible firmware.Modded/Patched Odin 3.13.1 (SHA256 error fixed!).

Download the Odin version of your choice from the below versions and then extract the zip file to get Odin.

How to flash with odin 3.10