Des vs de

There is this tricky thing in French - des and de with plural.

Almost all the French adjectives go after the noun they denote:

Un livre interessant

So, in plural they are used with plural indefinite 'des':

Des livres interessantes

But! when a noun is used with an adjective that precedes it, like:

Une belle femme

In this case the article for plural changes to 'de':

De belles femmes