I think you are asking for this functionality? You just make a new Group called owner, and only have the content that you want to make it editable only by the owner under this group. ie go to edit a page, click permissions, and have "owner" group only selected to edit the page.

Hope this helps

My idea is that users can create content, but can edit only their own.
If I create a group containing a set of users, everyone can edit the content of the group, and this is not good.
In joomla I had an extension that ran articles and granular permissions so.
I apologize for the language, I'm using the translator

I am interested in what others might say about this. I would look into making a custom attribute for the users, where they can edit this content - maybe on their profile page. Like a bio or something. You could place this anywhere but you most likely will have to make a custom block for it.

I think advanced permissions provides all of this.

Set 'Advanced permissions'

In config/site.php after 'define('PASSWORD_SALT',-------' line

Add:- define('PERMISSIONS_MODEL', 'advanced');?>

Then add user or group to parts of site or pages you want to allow access.

I tried with advanced permissions, but nothing.
There is not an attribute to indicate where to change only the content you create, own, and not by others with the same permissions.
In managing the permissions of the file manager is an option similar to my request.
The ability to search, modify, add their own files.
An addon that has this implementation is found in advanced forms / date display.

I'm looking forward for the solution for this problem too... hope someone could give a clue