diff --git a/Best Video Links/API b/Best Video Links/API
new file mode 100644
index 00000000..95a4f98a
--- /dev/null
+++ b/Best Video Links/API	
@@ -0,0 +1 @@
+1) https://www.youtube.com/watch?v=s7wmiS2mSXY
diff --git a/Best Video Links/CDN b/Best Video Links/CDN
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index 00000000..2c51cfcb
--- /dev/null
+++ b/Best Video Links/CDN	
@@ -0,0 +1 @@
+youtube.com/watch?v=Bsq5cKkS33I
diff --git a/Best Video Links/DNS b/Best Video Links/DNS
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index 00000000..3fa118dc
--- /dev/null
+++ b/Best Video Links/DNS	
@@ -0,0 +1 @@
+https://www.youtube.com/watch?v=HsQOWfc3Wic
diff --git a/Best Video Links/Load Balancer b/Best Video Links/Load Balancer
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index 00000000..c2e8155f
--- /dev/null
+++ b/Best Video Links/Load Balancer	
@@ -0,0 +1,3 @@
+1) https://www.youtube.com/watch?v=zHn2G71hoIk
+
+2) https://www.youtube.com/watch?v=K0Ta65OqQkY&t=6s
diff --git a/Best Video Links/Memory Cache b/Best Video Links/Memory Cache
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index 00000000..0fdaad7c
--- /dev/null
+++ b/Best Video Links/Memory Cache	
@@ -0,0 +1,5 @@
+1) The real theory simplified in terms of Computer Networks, suggested for visualizing about caching in depth and in animated video
+https://www.youtube.com/watch?v=yi0FhRqDJfo
+
+2) The concept in terms of System Design
+https://www.youtube.com/watch?v=sXEQIAo-zJI
diff --git a/Best Video Links/Service Workers b/Best Video Links/Service Workers
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index 00000000..d8c6b057
--- /dev/null
+++ b/Best Video Links/Service Workers	
@@ -0,0 +1,3 @@
+1) https://www.youtube.com/watch?v=wl3kKBw-MGk
+
+2) https://youtu.be/A6MHtKkA0CA?t=43
diff --git a/Best Video Links/Web Server b/Best Video Links/Web Server
new file mode 100644
index 00000000..39fde165
--- /dev/null
+++ b/Best Video Links/Web Server	
@@ -0,0 +1 @@
+1) https://www.youtube.com/watch?v=tAjbGEGF34A