diff --git a/src/data/roadmaps/backend/content/120-real-time-data.md b/src/data/roadmaps/backend/content/120-real-time-data.md
index 1ccdd66b9..7e65b38ec 100644
--- a/src/data/roadmaps/backend/content/120-real-time-data.md
+++ b/src/data/roadmaps/backend/content/120-real-time-data.md
@@ -5,4 +5,7 @@ There are many ways to get real time data from the backend. Some of them are:
 - Websockets
 - Server Sent Events
 - Long Polling
-- Short Polling
\ No newline at end of file
+- Short Polling
+
+- [Introduction to HTTP Polling and Web Sockets](https://www.youtube.com/watch?v=OsgrJDMPl58)
+- [Introduction to Long Polling](https://www.pubnub.com/guides/long-polling/)