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.

Sometime we are forgotting the very basics when we are thinking about the SEO for our Joomla website. Did you asked yourself this simplequestion:

What the alias field is for and how to use it to your advantage?