What is the best way to learn a foreign language?

I think the best way to learn a foreign language is in a class and outside of class. In the class, teachers can teach students a lot of knowledge which they can't get at home. For example, in the English class students can study how to say and spell words. At the same time, students also can discuss with their classmates about their questions. It is fun to study something with friends. Learning a second language is also need time to absorb, so students still have to practice at home. When they read and write a lots, they will become more and more familiar with English.
If people only study at school, they cannot remember all the stuff. If people only study at home, they cannot get enough knowledge either. By the way, I think a person who always stays at home for studying seems like machines. People need to spend time on life such as by bus and go outside. I remember a sentence in a movie. Life is hard to fight, but it worths to fight.
Learning a second language is hard for me. However, everyone needs to have faith of success. I advise this way to study English just as our situation. We spend eight hours to study English, right?