Update free-courses-en.md (#11325)

Author: sohansai

courses/free-courses-en.md

@@ -1682,8 +1682,12 @@
 
 ### System Design
 
+* [Basics of System Design](https://www.youtube.com/playlist?list=PLt4nG7RVVk1g_LutiJ8_LvE914rIE5z4u) - Coding Simplified
+* [System Design](https://www.youtube.com/playlist?list=PLsdq-3Z1EPT27BuTnJ_trF7BsaTpYLqst) - Arpit Bhayani
 * [System Design](https://www.youtube.com/playlist?list=PLMCXHnjXnTnvo6alSjVkgxV-VH6EPyvoX) - Gaurav Sen
+* [System Design](https://www.youtube.com/playlist?list=PLliXPok7ZonnZd99TE0Zzn1MZlE4u08GW) - Keerti Purswani
 * [System Design Fundamentals](https://www.youtube.com/playlist?list=PLCRMIe5FDPsd0gVs500xeOewfySTsmEjf) - ByteByteGo
+* [System Design Interview Preparation Series](https://www.youtube.com/playlist?list=PLhgw50vUymycJPN6ZbGTpVKAJ0cL4OEH3) - codeKarle
 * [System Design Primer Course](https://www.youtube.com/playlist?list=PLTCrU9sGyburBw9wNOHebv9SjlE4Elv5a) - sudoCODE