https://www.spanish.cl/Grammar/Notes/Por_vs_Para.htm This link explains when we have to use POR or PARA. I hope it can help you.

Hello Christen, hope you're doing great! The use of "por" and "para" depends on the situation. For example: 1. Tengo este libro PARA mi clase. Which means: I have this book FOR my class. 2. Tengo este libro POR mi clase. Which means: I have this book BECAUSE of my class. Do you see the difference? It doesn't have a huge difference but the reason why you have the book doesn't mean the same. Other correct sentences: 1. El regalo es para mi hermana. The gift is FOR my sister. 2. Necesito lápiz y papel para escribir mi nombre. 3. Quiero una cuchara para comer mi sopa. Hope it helped you out. If you have another question don't mind to ask me. Have a nice day.

"Para" para esos casos. Tal vez esto te sirva: spanishdict.com/guide/quick-tips-for-understanding-por-and-para

Si, uno de los usos del "para" es para expresar finalidad.