Nokia android phones are released with locked bootloader and bloatware, so Nokia 3 released with locked bootloader and bloatware. So you need to unlock bootloader before tweaking your phone. After unlocking the device, you can install custom recovery like TWRP and root using custom recovery.
Download required files from download section above.
Setup adb and fastboot
Download TWRP recovery.
Open cmd windows by Shift + MouseRight click.
Connect your phone to PC.
Now paste this command on command window and hit enter to reboot your phone into bootloader (FASTBOOT) mode.
adb reboot bootloader
Flash TWRP recovery by this command.
fastboot flash recovery recovery.img
Reboot the device.
fastboot reboot
Now install supersu from TWRP recovery.
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