to know about; to be aware ofUsed to express having information about something or someone, or being aware of it. Common with nouns and pronouns, as in saber de algo or saber de alguém. It can also imply hearing news about someone in some contexts.
PO: Você sabe de algum restaurante bom por aqui? Eu queria saber de um que ficasse aberto até tarde.
EN: Do you know of any good restaurant around here? I wanted to know of one that stayed open late.