Two types of vocabulary learning strategies which are direct strategies and indirect strategies.
a) direct strategies: consists of memory strategies, cognitive strategies and compensation strategies. (Oxford, 1989; Nie & Zhou, 2017)
b) indirect strategies: "provide indirect support for language learning through focusing, planning, evaluating, seeking opportunities, controlling anxiety, increasing cooperation and empathy and other means" (Oxford, 1989; Nie & Zhou, 2017)