This is how you make most adjectives agree. Add "e" for fem words & add a "s" for plural.
This is how a person make a masculine adjective that ends in - eux fem. Ex: heureux = heureuse.
Most adjectives go after.
Negation:
"ne" and "pas" are the two word that would make a sentence negative.
Ex: vous jouez au basket.
Vous ne jouez pas au basket
Ex: Il est riche.
Il n'est pas riche