How do we use TO as a preposition?

As a destination

• He is going to the bathroom 

As a Receiver 

• Karen gave the lunch to her son

With time

• The bus  arrives at a quarter to six

After verbs

• Yesterday we listened to our favorite song 

After adjectives 

• She was so kind to me

A noun

• Is this the flight to Mexico?

To (Infinitive)

• I am calling to ask you about our dog.

https://dictionary.cambridge.org/es/gramatica/gramatica-britanica/to