How to restore file permissions after wrong chown All the files whether system files or drive are owned by root:wheel. What should I do?

Currently my Mac only opens in recovery mode.

I use mac OS Catalina 

I stuck with recovery terminal what is the default ownership for all these files 


first I command this wrong command chown -R _www:_www /
 and destroyed my mac then i command on recovery terminal 
chown -R root /
which made things worse i think

I reinstalled Mac now I am stuck here. The old password doesn't work. Does Mac have a default name and password or what
The files and directories in / are always owned by root/wheel, there is nothing which seems wrong on your screenshot.