Prepositions are used to link words. They don't have a meaning on their own. The preposition a is used in many different ways. Here are a few of many examples:
going to + infinitive Voy a lavarme las manos.
I am going to wash my hands. María les va a dar el dinero.
María is going to give them the money.
to introduce people Te quiero presentar a una amiga.
I want to introduce a friend to you. Juan, te presento a María.
Juan, let me introduce you to María.
to express where you are going or to whom something is aimed at Fuimos a Barcelona en avión.
We went to Barcelona by airplane. Él va a su casa.
He goes to his house. Nosotros visitamos a nuestra abuela.
We visit our grandma.
to accompany certain verbs No me acostumbro a la vida universitaria.
I don't get used to college life. No nos atrevimos a decir nada.
We did not dare to say anything.
to express what time an event ocurred No pude acostarme a las 9 porque tenía muchas tareas que hacer.
I could not go to bed at 9 because I had too much homework.
Video - Use of the Preposition "a"
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