You can learn multiple languages at the same time, however there are some pitfalls you need to avoid. In this video we talk about how to approach learning two or more languages at once so that you can become a polyglot!
Learn languages through comprehensible input: https://www.lenguia.com/
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Learn more about Comprehensible Input:
https://www.youtube.com/watch?v=COf1cuHmzqw
How & Why I'm learning Japanese:
https://youtu.be/wxaMd6iivv4