Hello SeVerdia;
As I am sure you are now painfully aware, your quest for documentation and tutorials for this particular application will be frustrating and will indeed continue well into the future.
God grant me the serenity to accept the things I cannot change, to change the things I can and the wisdom to know the difference. 
I must keep that in mind when it comes to the invisible Joomla! documentation.
As far as I know, here is how the Joomla! folks think their documentation should be designed and laid out. Must be true, they do it this way.
- The user's guide is a PDF file
- Tutorials and General How-To's are generally 3rd Party Documents (RedEvolution and Netshine are good)
- The Administrative Information is simple content using the Joomla! CMS (Which means it Cannot Be Downloaded)
- The Developer Information is again simple content using the Joomla! CMS (Which means it Cannot Be Downloaded)
- Forum Support
painful when you are searching the forum using real words and not some made up word, or mispelled word.
To be fair, let me explain. On the one hand, the folks at Joomla! are developers and as developers they are very proud of their achievements as coders, developers, programmers and the like. They know what you want before you know you want it. They have done a great job at writing code especially given the fact the footprint of Joomla! is very small and the function is really very impressive. I seldom find problematic code, only on 4 occasions have I found problems, but the forums did help albeit akin to finding a needle in the proverbial haystack. So I made my changes and kept on moving along my particular path without any real pains, or cramping.

As developers these folks are not going to help you by writing user documents and tutorials that describe the functions that they themselves designed and coded with a particular intention in mind. Heck, that would make too much sense, but to be fair, it is a great deal of work.
In my opinion, the documentation sucks. It is the project's greatest shortcoming from an enterprise perspective. The lack of documentation keeps the project far behind other Open Source Portals, or CMS' such as Plone, just an example, not a recommendation. Joomla! works.
If you read Michelle's post, you should have the clear picture. You ain't gonna get no more than what you got now.
Michelle Bisson wrote:
The General Documentation team's mandate is to create the two reference manuals : User Manual and Administrator manual, and take care of the Help Site. We do not have the personal resources to provide more at this time.
If I can help you, please let me know. If you want to know more about where I am coming from and what the core team really thinks, here is a link for ya.
http://forum.joomla.org/index.php/topic ... #msg313673Best Regards, Allen