Update index.md

Author: Adez017

blog/ETL-pipeline-tutorial/index.md

@@ -81,6 +81,16 @@ Think of it as the key to a door. Before ADF can read from your Blob Storage or
 
 You create a Linked Service once, then reuse it across as many datasets and pipelines as you need.
 
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+  width="100%"
+  height="400"
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+  title="YouTube video player"
+  frameborder="0"
+  allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
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+
 **Examples:**
 - `AzureStorageLinkedService` → connects to your ADLS Gen2 account
 - `AzureSqlLinkedService` → connects to your Azure SQL Database
@@ -353,4 +363,4 @@ I'm **Aditya Singh Rathore**, a Data Engineer passionate about building modern,
 
 📩 Stuck on a specific ADF activity or pipeline pattern? Drop your question in the comments.
 
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