[header] How to study vocabulary words [title] Choose paper or electronic flash cards. [step] Paper flash cards are easy to carry around, and writing by hand may help you memorize the words more than typing. On the other hand, you can't lose a phone app or online tool. 
Some flash card software even lets you speak the words aloud, then writes the cards for you. [substeps] If using paper cards, try to find something small that you can carry in your pocket.