How do I know which adjectives are placed before or after a noun?

An adjective is a word that describes a noun, such as sweet, yellow and delicious. In French, adjectives agree in number and gender with the noun or pronoun they qualify.Unlike in English, where most adjectives are placed before the noun (such as the delicious cake), in French, the majority of adjectives are placed after the noun, eg. le gâteau delicieuxHowever, some frequent adjectives are placed before the noun (BAGS: Beauty, Age, Goodness, Size):B for beauty: beau, joliA for age: jeune, vieux, nouveauG for goodness: bon, meilleur, mauvais, gentilS for size: petit, haut, gros