2. Immersion Program
Pros: Forces you to live in a different country and speak the native language at all times
Cons: Requires a big portion of your time, money, and commitment
Immersion programs, if you can afford it, can be a great way to learn a language. Depending on the program, you can be set up with a family host that only speaks your target language, undergo classes, and live in the foreign country that speaks your target language.