What is Alexa? How to use Alexa skills & the best devices

has released several smart home devices including Echo and Echo Look. But what is Alexa? What can Alexa do? And what are the best Alexa skills to use?
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Top 15 And Best Alexa Skills That Every Echo User Should Know

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Alexa Skills

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How Alexa works? Your guide to Natural Language Processing (AI), by Alexandre Gonfalonieri