Quand je dois utiliser 'des' et 'de'

Question

Est-ce que quelqu'un peux m'expliquer la difference entry:

Je fais des erreurs.

Mais quand j'ajoute 'beaucoup' ca change a d(e)?

Je fais beaucoup d'erreurs.

Pourquoi la phrase suivante est-elle fausse ?

Je fais beaucoup des erreurs. | faux

Et c'est pas assez. Mais la phrase suivante est-elle correcte encore.

Je fais parfois des erreurs.

Merci!

After writing this I get the feeling 'des' is not just plural of 'de', rather it means 'some', and only 'some'. Does anyone have a mnemonic for me? — Daniel Stephens, Oct 21 '18 at 02:18
"De" is a preposition, and does not have a plural form. "Des" can be either a contraction of the preposition "de" and the definite plural article "les" (="of the"), or an indefinite plural article (="some"). — sumelic, Oct 21 '18 at 02:44
Awesome, thanks! I think that answered my question. Feel free to post this as an answer instead so I can give you the credit — Daniel Stephens, Oct 21 '18 at 02:48
I think there might be some older posts that cover this topic, so first I'm going to spend a bit of time trying to see if there is one that gives a more complete answer — sumelic, Oct 21 '18 at 02:48
Maybe the answer here would be helpful: Tout savoir sur ces combinaisons de petits mots qui contiennent « de » Also see Why is it “Ils ont besoin de livres et de DVDs” and not “des livres et des DVDs”? and When to use “de” or “des” after nouns and after “beaucoup”? — sumelic, Oct 21 '18 at 02:51

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