--- lbbs/Tutorial.md	2025/12/25 12:28:28	1.1
+++ lbbs/Tutorial.md	2025/12/26 06:27:54	1.3
@@ -5,13 +5,15 @@ All tutorial videos are conducted in Man
 
 Installation Guide
 ==================
-[Web version](https://www.bilibili.com/video/BV1BqBGBFExZ/) [view on Youtube](https://www.youtube.com/watch?v=AzMRaLtpGSc)  
-[Telnet version](https://www.bilibili.com/video/BV186BLBREuz/) [view on Youtube](https://www.youtube.com/watch?v=h2Eex3b2XpY)  
+[Web version](https://www.bilibili.com/video/BV1BqBGBFExZ/) [watch on Youtube](https://www.youtube.com/watch?v=AzMRaLtpGSc)  
+[Telnet version](https://www.bilibili.com/video/BV186BLBREuz/) [watch on Youtube](https://www.youtube.com/watch?v=h2Eex3b2XpY)  
 
 
 Introduction of Technical Design
 ==================
-[Talk 1 --- Background of LBBS project](https://www.bilibili.com/video/BV1wqBjB2E5L/) [view on Youtube](https://www.youtube.com/watch?v=BjNz187AhFI)  
-[Talk 2 --- Architecture of Network Server with Socket Programming](https://www.bilibili.com/video/BV1ZUBDBKEhA/) [view on Youtube](https://www.youtube.com/watch?v=eqBXOjG2BbI)  
-[Talk 3 --- Optimization for High-concurrent Traversal and Browse of Articles](https://www.bilibili.com/video/BV16mBXByEuA/) [view on Youtube](https://www.youtube.com/watch?v=0MzrSFdq3fo)  
-[Talk 4 --- Difficulties in Building Text Editor](https://www.bilibili.com/video/BV1fKBXBkESL/) [view on Youtube](https://www.youtube.com/watch?v=KgaX3auf8pA)  
+[Talk 1 --- Background of LBBS project](https://www.bilibili.com/video/BV1wqBjB2E5L/) [watch on Youtube](https://www.youtube.com/watch?v=BjNz187AhFI)  
+[Talk 2 --- Architecture of Network Server with Socket Programming](https://www.bilibili.com/video/BV1ZUBDBKEhA/) [watch on Youtube](https://www.youtube.com/watch?v=eqBXOjG2BbI)  
+[Talk 3 --- Optimization for High-concurrent Traversal and Browse of Articles](https://www.bilibili.com/video/BV16mBXByEuA/) [watch on Youtube](https://www.youtube.com/watch?v=0MzrSFdq3fo)  
+[Talk 4 --- Difficulties in Building Text Editor](https://www.bilibili.com/video/BV1fKBXBkESL/) [watch on Youtube](https://www.youtube.com/watch?v=KgaX3auf8pA)  
+[Talk 5 --- Data Structures and Algorithms](https://www.bilibili.com/video/BV1B7BoBQEcD/) [watch on Youtube](https://www.youtube.com/watch?v=fJsAtVQZNv0)  
+[Talk 6 --- Access Control and Data Security](https://www.bilibili.com/video/BV1enBaBkErp/) [watch on Youtube](https://www.youtube.com/watch?v=MuQEQ_6wKu0)