Short answers, pulled from the story.
The Duffer Brothers pitched the story to about fifteen cable networks in early 2015. Netflix purchased the whole season for an undisclosed sum in April of that same year.
Stranger Things is set in the fictional rural town of Hawkins, Indiana. The series was originally known as Montauk and set near Long Island, New York before the narrative changed.
Millie Bobby Brown took an initially undisclosed role as Eleven while filming began in November 2015 around Atlanta, Georgia. Production used Emory University's former Georgia Mental Health Institute as the Hawkins National Laboratory site.
Forty point seven million households watched the third season within four days. Sixty-four million households viewed it within one month, setting a new record for the platform.
Charlie Kessler filed a lawsuit in April 2018 claiming the brothers stole ideas from his short film Montauk which he debuted at the 2012 Hamptons International Film Festival. He sought one-third of the income made from the series after pitching his project to them in April 2014.