When good folks like you ask about "NodeMCU" ... it isn't clear if you are asking about "NodeMCU as an ESP8266 device" in which case most ESP8266 knowledge is useful or if when you ask about "NodeMCU" ... you are asking about Lua programming as supplied by the Github project called "nodemcu-firmware" which advertizes itself as "Lua based interactive firmware for mcu like esp8266".
My response was trying to point out that when someone asks about "NodeMCU" without further clarification, it can be a guess as to whether we mean "ESP8266 hardware (NodeMCU ESP8266 hardware)" or "Lua implementation (NodeMCU firmware that runs on an ESP8266)".
I think what you may be looking for are the Lua language forums that can be found here:
viewforum.php?f=17