You know how to use partitive articles (du, de la, de l', des) in affirmative sentences by now (see Du/de la/de l'/des = Some/any (French Partitive Articles)). In negative sentences, they change form.
Learn how to form partitive articles in negative sentences in French
Now look at these negative sentences:
Partitive articles du, de la, de l' and des all become de or d' (in front of a vowel or mute h) in negative sentences using ne...pas, ne...jamais, ne...plus etc (See also N'avoir plus de = To have none left (French Negations))
This rule does NOT apply to sentences using the verb être and other List of French "state verbs" - "verbes d'état", with which the partitive article doesn't change.
Also see Un/une become de/d' in negative sentences in French (French Indefinite Articles)
Note that definite articles (le, la, l', les) don't change in negative sentences:
J'aime le chocolat. -> Je n'aime pas le chocolat.
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Examples and resources
(literally: At the moment, I don't do window-licking, I do screen-licking!)