Nouns are usually preceded by the (article) o, or a: o hotel, a casa
Names of people and places (proper nouns) are almost always preceded by an article: o Brasil, a Sandra.
Mine, yours, his & hers (possessive pronouns) are also gendered: seu trabalho, sua cozinha.
article M o barco (the boat)
article F a feira (the fair)
proper noun M o Rio de Janeiro (the Rio de Janeiro)
proper noun F a Marissa (the Marissa)
possessive pronoun M seu carro (your car)
possessive pronoun M meu carro (my car)
possessive pronoun F sua bicicleta (your bicycle)
possessive pronoun F minha bicicleta (my bicycle)
Past participles and adjectives take gender-endings to agree with their subject.
past-participle M O zoológico está aberto. (The zoo is open.)
past-participle F A janela está aberta. (The window is open.)
adjective M É um bom hotel. (It's a good hotel.)
adjective F É uma boa praia. (It's a good beach.)
adjective M Ela é muito bonita. (She's very pretty.)
adjective F Ele é muito bonito. (He's very handsome.)