How to add access to www-data files?

Question

Nginx

I installed everything according to the manual
https://www.digitalocean.com/community/tutorials/h...
I'm doing all the actions as root, I don't know how it can be done differently (I just started getting acquainted with unix systems)
I uploaded the site to a folder /var/www/site.com/html/app An
index file located at the root of the site is available.
But I need to go to site.com/app i.e. I need access to /var/www/site.com/html/app
Support wrote that I need to add www-data access
How to do it right?

Answer 1

change folder owner and group

chown -R www-data:www-data /var/www/site.com/html/app