Firstly, most of us find trouble learning new words. There is one way to make it easier. You can write down words on the different sheets of paper and their definitions on the other side. By picking these cards randomly you can master these words more easily.
Secondly, broadening your dictionary and achieving better skills in grammar also is very important. It can be reached by reading books, journals and news papers in a certain foreign language. You can also watch movies and listen to music.
Finally, the most important skill of language is speaking fluently. The best way to achieve it is going abroad. You will be constrained to communicate. There also is more simple and cheaper way by finding a pen-friend or just practicing to speak with your friends.
In conclusion, learning languages is very essential, it opens up new opportunities and gives you perspectives that you might never have encountered otherwise.