While watching YouTube and Netflix can be a valuable tool in language learning, it's unlikely to be sufficient on its own. These platforms provide exposure to authentic language use, improving listening comprehension, vocabulary, and pronunciation. However, learning a language typically requires a combination of methods, including active practice, grammar study, and speaking with others.

For example, YouTube offers language tutorials, but you’ll need to practice speaking, writing, and engaging in conversations to achieve fluency. Learning language with Netflix can be useful for reinforcing vocabulary and sentence structure, especially if you use subtitles, but it doesn't provide structured lessons or interaction.

To learn a language effectively, use YouTube and Netflix as part of a broader study plan, which could include apps, textbooks, language exchange, and real-life practice. This multi-faceted approach is key to becoming proficient in any language.