Immigration Site

Hello Guys
I just got my labor approved and I am about to file I-140.My question is does the work experience letters needs to be in detail? I mean does it need to have Skillset also apart from designation and dates.I am getting multiple conflicting answers from different people..I would really appreciate if anyone can clarify this for me..

Thanks in advance.

Hello Guys
I just got my labor approved and I am about to file I-140.My question is does the work experience letters needs to be in detail? I mean does it need to have Skillset also apart from designation and dates.I am getting multiple conflicting answers from different people..I would really appreciate if anyone can clarify this for me..

Thanks in advance. did get any format of experience letters ?