Update document.md

document.md

@@ -2,4 +2,19 @@
 
 ## Section 1 (Jurney to the Cloud)
 
-## Section 2 (What is Cloud Computing)
+## Section 2 (What is Cloud Computing)
+### Minimum Sections Of a Cloud Service Provider:
+    1- Infrustructure 
+    2- Software Stack
+    3- Users And Apps
+
+### 1- Infrustructure 
+Network
+Storage (SAN, SDS, ... )
+Servers
+Virtualization
+WAN 
+
+traffic between servers (West-East)
+traffic between user and servers (North-South)
+