How to change folder permissions on centos server?

Question

linux

Good day. The point is this. There is a created folder whose owner is user1, and apache is running from him and the site is working. User1 also has a user1 group. Inside this folder there is a nesting in several directories /var/www/user1/data/www
I created user2 and placed it in the user1 group, I also registered that it has a home directory /var/www/user1/data/www
However, I can’t to come on ftp, I receive an error "500 OOPS: cannot change directory". As far as I understand, that the problem is in the rights. By googling, I came to the conclusion that I need to allow all users of the user1 group to read and modify files and folders on the server. Hence the question, if I execute the command,
chmod -R ug+rw /var/www/user1/data/www
can I normally use ftp after that, in order to change all sorts of css files through the usual fileZilla, etc.?

Answer 1

Change permissions
755->775
644->664
It's some kind of gesture

Answer 2

If you looked at the rules in links in more detail, you noticed that there are only rights to the file
it looks like this, ls -la
but it changes like this (potentially a very dangerous command and very fast, so always write the full path without using .
chown -R user2:user1 /var/www/user1/www
As far as I understand you have user user2 group user1