In learning a language, it’s obviously important to have a dictionary. Others would prefer the hard copies while personally, I would recommend electronic ones. You can buy these or you can also have it for free!
Way back when I first started learning Korean, I am already using the online Naver dictionary. It’s very user-friendly and also provides wide selection of sample sentences to get a better grasp of the word’s idea and when to use it. You can make your search in English and translate it to Korean and vice versa.
I have found this free Kor-Eng-Kor dictionary app on Play Store. What’s good about this app is that it’s an all in one app, though I mainly (and solely) use Naver, it also includes other sites such as Daum and Urban depending on your preference. As for Naver, it has the same functions or tabs for the word meaning and sample sentences as that in the web.
Go on try it and let me know what you think! Have fun! 🙂