Ok, we know that: '' Partitive articles, du, de la, & de l' (some/any) are used with mass nouns. Definite articles (le, la, l', les) and indefinite articles (un/une/des) are used with countable nouns.
Then what partitive ''des'' is used for? What is the difference between those two ''des''? The indefinite ''des'' vs the partitive ''des''. Are not there any uncountable nouns that have any plural form or something like that?