Home/Self-Learn/Communication-ESP32.md

@@ -125,7 +125,7 @@ WiFi.begin(SSID,PWD,6);
 
 ### Communication via MQTT
 
-> In an industrial context, the MQTT protocol is often used for communication between entities. It allows for cleanly structured and efficiently distributed messages. If you are unfamiliar with MQTT, you can review some basics on our [fundamentals page](#). At a minimum, you should understand the basic procedures and differences compared to, for example, REST, to comprehend the advantages of MQTT in practice.
+> In an industrial context, the MQTT protocol is often used for communication between entities. It allows for cleanly structured and efficiently distributed messages. If you are unfamiliar with MQTT, you can review some basics [fundamentals page](https://www.emqx.com/en/blog/the-easiest-guide-to-getting-started-with-mqtt). At a minimum, you should understand the basic procedures and differences compared to, for example, REST, to comprehend the advantages of MQTT in practice.
 
 ### Data format as JSON-Object