understand

(transitive, of a skill, task, profession, etc.) To be thoroughly familiar with; to be able to undertake properly.

(transitive, intransitive, of communication or means of communication: words, statements, signs, etc.) To know the meaning of; to parse or have parsed correctly; to comprehend.

(transitive, usually with clause as object) To comprehend a fact or principle; to regard or come to regard a belief as such.