Online Tutorials

Henry's Bench:

http://henrysbench.capnfatz.com/henrys-bench/arduino-projects-tips-and-more/arduino-esp8266-lolin-nodemcu-getting-started/

Robo India:

https://roboindia.com/tutorials/digital-output-nodemcu/

Instructables:

https://www.instructables.com/class/Internet-of-Things-Class/