Hacia can also be used in expressions when "to" stands for "towards."  Example: to the left Translation: hacia la izquierda " If an attitude or action is performed to someone or something, "hacia" can be used.  Example: She is hostile to her sister. Translation: Es hostil hacia su hermana.

TL;DR in Chinese:
表示动作时用“hacia”。 用“hacia”来定义接受者的动作。