Updated QOD September 2021 (markdown)

QOD-September-2021.md

@@ -82,12 +82,12 @@ No | Name | Role | Contact
 **Description:** Did you ever wonder if you can build a personal tracking platform similar to how Google tracks you but without Google tracking you? Come and join me for an informal session where I will show you how easy it is to build a platform like this using FOSS GIS. Note the presentation will use QGIS but also focus a lot on other related tools needed in the workflow.
 
 **Stack Links:**
-- https://owntracks.org/
-- https://mqtt.org/
-- https://mosquitto.org/
-- https://nodered.org/
-- https://postgis.net/
-- https://qgis.org/
+- https://owntracks.org/ For tracking device location and telemetry information
+- https://mqtt.org/ For sending data from the device to the server
+- https://mosquitto.org/ For receiving and managing messages
+- https://nodered.org/ For transforming information and building dashboards
+- https://postgis.net/ For data storage and management
+- https://qgis.org/ For map making and GIS
 
 
 ## QGIS a vibrant Community