General Reference MDN Node.js Sources and Authors with several interesting articles Byte Archer RisingStack Jake Archibald David Walsh Stephen Cleary SessionStack: How Javascript Works Other sources I/O Demistified Concurrency vs Multi Threading vs Asynchronous Programming The Javascript Event Loop Explained Manejando la asincronía en Javascript Threads vs Async Is Async Await truly non blocking Javascript promises order of execution Event loop queue vs Job queue