Categories and multiple subcategories

I am a new user of Glide, I would like to achieve something in my app, and can’t figure out the best way to do this.
I want to be able for a user to complete information for 4 categories.
For each category, add as much domain as he/she wishes and a corresponding level (1,2,3) of mastery of that domain. Visually, in a word document, it will look like this:

Thanks for your help

I think you can have a table to do this, with the structure as below.

User ID Category Domain Level
ID1 Langage/BDD Python 2
ID1 Langage/BDD MySQL 3
ID2 Méthodologies Agile-SAFE 2

Then display that in an inline list, grouped by the category.

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