Motorola

root without twrp

recover boot.img in firmaware sotck image
install magisk Manager on your smartphone apk here
put boot.img on your smartphone
in magisk click pn install and select your boot.img
magisk_patched.img will be store in your DATA folder recopy this file on your desktop
enter in fastboot by holding power button
on your computer enter fastboot devices to check if you see your device
following enter fastboot flash boot magisk_patched.img to flash
and fastboot reboot to reboot