about the topic
Si Juliette estuviera acá, ella sabría del tema.
If Juliette were here, she would know about it.
— La gran juerga (1966)
I prefer not to talk about it.
No sé mucho de esta parte del tema.
I don't know much about this part of the subject.
No tienes por qué quejarte del tema.
You have no reason to complain about the issue.
Tom evitó hacer cualquier comentario del tema.
Tom avoided making any comment on the matter.
No tiene más que un conocimiento superficial del tema.
He has only a superficial knowledge of the subject.