Here are some examples:
* Une belle maison: A beautiful house
* Un grand livre: A big book
* Un bon ami: A good friend
Exceptions:
There are a few exceptions to this rule. Here are some cases where adjectives come before the noun:
* Adjectives of size and quantity:
* Un petit chien: A small dog
* Deux grandes fenêtres: Two large windows
* Adjectives of beauty and ugliness:
* Un beau jardin: A beautiful garden
* Une vilaine voiture: An ugly car
* Adjectives used for emphasis:
* Un pauvre homme: A poor man (meaning he is unlucky)
* Un brave homme: A brave man
* Some adjectives are always placed before the noun:
* Un certain monsieur: A certain gentleman
* Un seul livre: One single book
* Un autre problème: Another problem
Position with compound nouns:
When an adjective modifies a compound noun (two or more words joined together), it usually comes after the whole compound noun.
* Un livre d'histoire ancien: An old history book
Note:
There are some variations in adjective placement depending on the specific adjective and the context. The best way to learn the rules is to practice and pay attention to how adjectives are used in different sentences.