We use the preposition para (not por) to express a purpose, goal or objective. In this case, it is always followed by an infinitive. Read and listen to these examples:
Corro para estar en forma.I run in order to keep fit.
Habla para practicar el idioma.He speaks to practise the language.
Están ahorrando para comprar una casa.They are saving money in order to buy a house.
See also
Using por (not para) to express the originating cause or reason Want to make sure your Spanish sounds confident?
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