Guides:

Notice: It may wipe all your data including those in internal storage.Part 1 - HOW-TO FLASH TWRP:1. In your ROM, go to Settings -> About device. Tap 7 times on Build number to enable Developer options.2. Go to Settings -> Developer options and enable OEM Unlock option.3. Download and Install Samsung Mobile Phones Drivers.- Option 1: Download and Install Smart Switch for PC. - Option 2: Download and Install standalone driver package 4. Download and extract Odin (Samsung's Flash Tool) to your computer.5. Download a .tar image of TWRP.6. Reboot your device to download mode.- Hold [VOLUME DOWN] + [BIXBY] + [POWER] for approx. 15 seconds.- Read the warning carefully.- If you agree, press [VOLUME UP] to get into Download mode. If you don't agree, STOP.7. Open Odin and place that TWRP tar file in the [AP] slot.8. Connect your phone.9. Hold [VOLUME UP] + [BIXBY] + [POWER] on your phone and then press start on Odin.10. Wait for the phone to reboot. DO NOT release [VOLUME UP] + [BIXBY] + [POWER] or you may not reboot into TWRP.Part 2 - HOW-TO INITIALIZE TWRP: (for new phones)1. If you completed Part 1 successfully, you should be in TWRP now. At this point, you will reach the screen asking you if you want to allow system modifications.2. Select "Keep /system RO". (Don't swipe right or you may not be able to boot into system if you failed to complete next steps. However, you can swipe right to allow modifications if you are confident that you can complete next steps.)3. Go to "Wipe" menu of TWRP and you will find "Format Data". Press "Format Data" and type "yes" to continue.4. Go to "Reboot" menu and Press "Recovery" to reboot TWRP.5. Download the latest dm-verity and force encryption disabler zip on your computer.6. Transfer the zip to your phone.- Option 1: MTP: Connect your phone with computer and just copy the zip to internal storage. (similar to how you transfer files when in system.)- Option 2: ADB: Connect your phone with computer and run command "adb push /path/to/zip /sdcard/".- Option 3: External SD: Copy the zip to an external SD and then insert the card to your phone.7. Go to "Install" menu of TWRP and flash the zip.TWRP is initialized and fully functional at this stage. Now you can either reboot into system or root, flash custom ROMs via TWRP.Part 3 - HOW-TO ROOT:1. Download the flashable zip.- Option 1: Magisk - Option 2: SuperSU (untested)2. Transfer the zip to your phone.3. Go to "Install" menu of TWRP and flash the zip.Part 3a - HOW-TO FLASH CUSTOM ROMS:1. Download the flashable zip.2. Transfer the zip to your phone.3. Go to "Install" menu of TWRP and flash the zip.Simple.