Thank you so much! But how can I use “para” and “a” correctly? Like this translation, I always confuse the use of “para” and “a”.

"para" is often used to say that something has a certain purpose or an addressee , for example:

This new law is to reduce the global warming ---- Esta nueva ley es para reducir el calentamiento global.
This cake is for you ----- Este pastel es para ti.

(purpose) These new boots are for walking in the snow ------ Estas botas son para caminar en la nieve.
(addressee) This new car is for your brother ------- Este coche nuevo es para tu hermano.

"A" is a preposition which has a lot of purposes, but the most used are to say who is affected by the verb:
I write many letters to my sister ------- Le escribo muchas cartas a mi hermana.
To talk about the distance between two things:
The train goes from USA to Mexico ----- El tren va de Estados Unidos a México
To describe the time in which somthing happens:
She left the party at one o'clock ----- ella dejó la fiesta a la una en punto.
to say that you or something are going somewhere:
she goes to the store ------ Ella va a la tienda
he goes to the market ----- Él va a el mercado/ Él va al mercado ("al" is the contraction between "a" and "el")

"a" has more uses so I really suggest you do some research about this preposition, I hope that this explanation has helped you.

It is really helpful, thank you for helping me to clarify.