https://medium.com/@kvosswinkel/is-javascript-synchronous-or-asynchronous-what-the-hell-is-a-promise-7aa9dd8f3bfb

https://medium.com/@maneesha.wijesinghe1/what-happens-when-you-type-an-url-in-the-browser-and-press-enter-bb0aa2449c1a

https://medium.com/front-end-weekly/ajax-async-callback-promise-e98f8074ebd7

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