Which is the best way to learn Engish?

In my opinion to learn  a foreign language
is more important to focus on
grammar before and then
vocabulary.If pupils learn eglish
through TV ,they cannot be able to create
 a sentence or phrase logically
 but they speak and write mechanically.So they can express freely in Engish because they have knowledge in expresing but not in grammar.Grammar is key of English and other competences as well,such as Reading,Writing,Listening and Speaking.