向 (xiàng) is a preposition that means "towards", and is used often when expressing or referring to a certain point in Chinese grammar.
When used as a preposition, "向" indicates an action that is performed towards a reference point, but doesn’t have any actual motion towards that point. An example of this in English is, "She looked inside the window." Note that there is no movement in the action.
她 一直 向 我 招手。
Note that wheras in English we would say "learn from someone", in Chinese this would be expressed as "learn toward someone", as in the last example sentence. Refer to the following example (and famous propaganda slogan):
向 雷锋 同志 学习 ！