Dot net code in SSIS? What should I learn in Dot net to implement it in SSIS?

Hi Team,

I work on SSIS and SSRS and I am aware of the fact that Dot net code and C# code can be written and used in MSBI and SQL Server. 

I wanted to know what should I learn in dot net, to implement it in MSBI.

Should I be master of Dot net? or Do I have few topics to start with?

I thought this is the best place I can ask.

Thanks in advance.
Satish Geddamuri