you want to learn is the key

It's different for each person. Each person needs to figure out their own learning style. I studied French for a long time. I am not yet fluent when speaking but I do understand a lot and can write pretty well. I find learning a language requires a lot of effort and dedication. I think it's important to find good learning materials. A good dictionary, language books. Listen to music in that language with lyrics, watch movies, and tv shows. Go to restaurants where the language is spoken. 

I have studied english for a long time and I don't have enough fluently than other people that have already, but there is a phrase that my last teacher told me ''If you really want to make something, you'll find the best way to get it''. And if someone wants to learn a foreign language just have to find any way to improve every day.

Some people learn watching movies, reading books, learning grammar or vocabulary through games, etc...and that's because no one is similar. 

And my best advice if someone wants to learn a foreign language... Love it!!!

if a person live among ppl which one wanna learn their language so its clearly the person can speak better than one just go to classes and study by books! books and grammer r not good for speaking.