What Is The Best Free Program To Learn Spanish? (I Need Help!) "¡Necesito ayudo, por favor!"

So I am very interested in learning Spanish. In the near future I want to travel to many countries that speak Spanish, and I want to be able to communicate well. What is the best Free program available?
I've been using Duoling, and it seems great?
Has anybody used this with success?
What is the best way you found to learn a new language?

Thank you for your help in advance :)

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