CLS stands for Common Language Specification. It is one the important components of CLR. In this video you will understand:
#What is CLS
#Common Language Specification importance
#Advantages of CLS

MSDN link for more details on CLS:
https://learn.microsoft.com/en-us/dotnet/standard/language-independence

Various playlists from this channel:

.NET fundamentals:
https://www.youtube.com/playlist?list=PLdHN14J7CHtYoXZUW2dRtjzxpL89bJCgf

Asp.net core tutorial playlist:
https://www.youtube.com/playlist?list=PLdHN14J7CHtaNVmE8D5_uhHV2FiPwUyrS

C# tutorial:
https://www.youtube.com/playlist?list=PLdHN14J7CHtY5Q_ylxVcU4BL5gxaBe0B0

C# programs for practice:
https://www.youtube.com/playlist?list=PLdHN14J7CHtZ4Sg8ST_xccaCItvU6vtbW