Once, everyone thought Rosetta Stone's pedagogy was the best. However, I learned that it contains inaccuracy when I apply what it taught me in real conversation.
Then, I gather that listening to songs of foreign languages was more helpful. Now, there are many songs or methods that apply dual subtitles to help one understand the content and learn the original language.
Now, there is Memrise (Android app - iOS app's audio is faulty at the moment), which is by far the greatest pedagogy in learning most anything that pertains to one's memory.