The words “only” and “just,” which correspond to solo in Spanish, translate as só in Portuguese. Note that the word só often appears at the end of a sentence.
English: He scored only one goal.
Spanish: Hizo solo un gol.
Portuguese: Ele fez só um gol. / Ele fez um gol só.
Don’t be fooled! The word solo exists in Portuguese, but it means “soil” (suelo in Spanish).