Yes, watching Netflix series or movies can be a helpful method for learning English. It provides exposure to authentic language, natural conversations, and different accents, which can significantly improve listening comprehension and pronunciation. By watching content with English subtitles, you can also connect spoken words to their written form, helping you expand your vocabulary and improve reading skills.

This method is especially useful for learning everyday language, idiomatic expressions, and slang, which might not be covered in traditional textbooks. It also helps with understanding cultural references and nuances in the language.

However, while language learning with Netflix is a great tool for immersion, it should be used in conjunction with other language-learning methods, such as speaking practice, grammar study, and writing exercises, to gain a well-rounded command of the language.