What's the difference, if any: "something itself" and "something in itself"???

Question

Tnx!!!!!!!!!!!!! You know, I'm a ESL speaker...

, you know,

Answer 1

Personally, I think either is acceptable. Problem can be that I use English English as a reference, American English may be somewhat different

Answer 2

I would say  something itself  would mean something by itself..

the other meaning within itself...it's true self.

example: This work itself is easy.

               This bird is not itself today.

How did I do ESL speaker?