Human beings. You need human beings to start a new language.

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I recommend something interactive and stimulating. Take a class, online or in person. Learn about the culture, not only the language. It makes it more fun and easy to remember.

Start with videos or movies with sub-titles, so you hear how the language is spoken, books to memorize the spelling of the words and definitions. so both.

Watch videos with subtitles first. You will get used with the sounds