This isn't the best TED talk I have ever seen, but It places some very helpful principles on learning languages that I think everyone on this forum can get benefits from. This is a very rough resume.
- Message: recognizing patterns and the building blocks in a language is essential. "When you understand the message, you acquire the language"
- Importance: the brain holds better information that it regards as useful. The language that you are learning will be learned faster and better when you regard it as relevant in your life.
- Observation: immerse yourself in the language and observe people's speaking and tone. Learn by listening and speaking with natives.
- Comprehension: language is not about memory or vocabulary, but comprehending sentences and their structures.
And mainly, have fun :)