This is the 2922nd most frequent French word.
fais
"Fais" means "do" or "make" (second-person singular present form of "faire").
The usage of 'fais' here is an imperative form, giving a direct instruction or advice to the listener to be careful.
Fais attention en traversant la rue.
Pay attention when crossing the street.
The word 'fais' here is the conjugated verb 'faire' in the first person singular present tense, indicating the speaker is actively doing the action of baking.
Je fais un gâteau pour l'anniversaire de ma sœur.
I am making a cake for my sister's birthday.
The word 'fais' is part of a question in the second person singular present tense, inquiring about activities performed by the addressed person to relax.