Is this a good practice for running a single user access server with nginx ? What is the limitation?

editing /etc/nginx/nginx.conf with

user www-data;

to

user nameWechoose;

for security-wise benefit?

My understanding of the change will limit me/nameWechoose to host only one website on a VPS? (not sure) but at the same time, I think we can run more websites as nameWechoose if we logon as nameWechoose.