Overview of steps for installing arduino IDE on Mac OS X with UNO and NodeMCU

Here I briefly list out the steps as a checklist or for getting an idea.  Full details should be easily found googling.

1. Download and install arduino IDE

2. For Uno,
     A. install the serial port driver - different UNO clones use different USB-to-serial chips.
     B. launch IDE,
     C. Select port from menu, tools>port
     D. Select board from menu, tools>board

3.  For NodeMcu,
     A. Preference, add nodemcu url to additional download link.  See their page.
     B. Download board info package using menu tools>board manager, filter enter nodemcu, install.
     C. Same selecting port.
     D. Select board – there are two versions:
          V0.9 is gen 1
          V1.0 is gen 2
         (Check your source which one you get.)

4. now in IDE, write up some code (aka sketch), click compile then upload.  that's it.

Here some ref links:
https://www.arduino.cc/en/Guide/MacOSX