I would like to have this scenario in Discourse

I would like to have a site like this, because I see that https://forum.openmandriva.org/ :

Category - is the language

  • sub-category ( I don’t know what is this name in discourse)
    *** Tag’s

This is posible and how to acomplish


Categories and Subcategories it’s exactly how Discourse works.
From the category page you can create all the categories you need (english-french-italian etc…) then when you need a subcategory the process is the same, you need only to choose the parent category.
For example in the plugin - Discourse Meta category all the subcategories have “plugin” as parent category:

As for the tags instead, you can use them anywhere, or limit them to the staff or to specific categories, see