What is the difference between the preposition 'a' and 'de'?
I am not sure if they both mean 'to/from'.
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Both prepositions can have a lot of different uses, but basically
a would be "to" and
de would be "from".
Denota de dónde es, viene o sale alguien o algo. La piedra es de Colmenar The stone is from Colmenar . Vengo de Aranjuez I come from Aranjuez .
Indica la dirección que lleva o el término a que se encamina alguien o algo. Voy a Roma, a palacio I'm going to Rome, to the palace . Estos libros van dirigidos a tu padre These books are addressed to your father .
Of course this is a huge oversimplification of the many uses of both prepositions.