OrangePi 3b is an amazing cmoplete board with 2, 4 or 8 Gb of RAM and a nice arm64 CPU.
Check your DHCP to know which IP has been assigned to your Opi3B and ssh into it as user root using password 1234.
Complete first setup, set root password and create an user, then reboot.
run armbian-config and move the installation to the emmc, format as etx4.