Know

cognocer (desus.)

(be acquainted or familiar with)

conocer

(be acquainted or familiar with)

conocer

(understand (a subject))

conocer

(have sexual relations with)

entender de

(understand (a subject))

estar informado

(be informed about)

saber

(be justifiably certain or sure about (something true))

saber

(have knowledge of)

saber de

(understand (a subject))

saber lo que es

(have knowledge of)

saber quién es

(have knowledge of)

saber qué es

(have knowledge of)