How to fix admin account file permissions after I deleted and restored it?

I deleted my administrator account and restored it using an answer I found from this post (link below).

I accidentally deleted administrator account and the other accounts are asking root password

So everything got restored...but I must have done something wrong because I got both accounts back but my original admin account had a new user ID and belonged to the group of my second one, which had the ID I had before.

Can I fix this by changing file permissions for the whole / file system?

And if so what are the default permissions? I don't wanna mess anything up...again.

You can change the permissions of the files

 chown -R user:group /path_directory

I suggest you, if there is only change in user ID then change the user ID of your new admin account to the old id:

usermod --uid [new UID for the user account]  USERNAME