Hello Mohamed,
I before posting here in the forum, I sent you a message on the Joomreem website. I already bought the extensions I mentioned this year, except for Autometa.
I even months back, I suggested this implement for version 3 of the game on Github:
github.com/getk2/k2-v3-dev-build/issues/292
What I need?
I decided to use tags as secondary categories, for the ease of creating them at the time of article creation. With tags, I can put as many as I want in the article. More practical and fast. Only disadvantage is that the tags are restricted, can not put description, images, videos and etc ... My idea would be the tags have the possibility to have this, so I could focus on seo.
In short: the tag system with almost all the requirements of the article system.
Here is an example, despite being much more than I need:
globoesporte.globo.com/atleta/messi.html
In this example, I could easily do in k2v3 by putting tags with extra fields.