This is the 3rd most frequent French word.
et
"And"
Here, 'et' is used as a conjunction to connect two nouns, 'pommes' and 'bananes', to indicate addition.
J'aime les pommes et les bananes.
I like apples and bananas.
'Et' functions as a conjunction linking two verbs, 'repose' and 'regarde', to form a coordinated compound predicate.
Marie étudie le matin, puis elle se repose et regarde la télévision.
Marie studies in the morning, then she rests and watches TV.
In this sentence, 'et' connects two adjective complements, 'courageux' and 'persévérant', describing the subject 'Il' together.