Bonjour Poonam,

I suspect that your query relates to adjectives  --  vieux singular masculine before the noun.

                                                                               --  vieille singular feminine before the noun

                                                                               --  nouveau singular masculine

                                                                              --  nouvelle singular feminine

The term B  A  G  S  provides a guide to those adjectives normally associated with appearing before the noun  --  Beauty  Age  Good / Bad  Size but this is not always universally the case. 

You may also like to have a look here for further information:-

https://kwiziq.learnfrenchwithalexa.com/questions/view/adjectives-before-a-noun-or-after-noun#AnswerAddForm:~:text=https%3A//www.french%2Dtest.com/my%2Dlanguages/french/view/118

Bonne continuation

Jim