How to restrict a user to access only one component in admin
Sometimes you need to allow a user to access and manage only one (or a few) Joomla! component in the backend. This is quite easy to set up, you need to use cleverly the ACL sytem Joomla has allready in.
Submitting content from frontend
Indeed, what's needed for a user to submit a new content item from the frontend, and how he/she should proceed?
First of all the user must have the privileges corresponding to the authorization level of "author" or above.
Also known as two step-authentication or two-step verification, two-factor authentication is an additional security option for online accounts to help keep them safe.
When the Joomla site is offline, only Super Users can log in
A client of mine asked this question: "How can I allow registered users to log in and see the site even in offline mode, without giving them Super user privileges?"