i'd've thought that any FEA text will tell you "boundary conditions to suit the application" and would talk about special bounday conditions, like symmetry.
I mean , in general , when you are modelling in FEM and for example if your loading or model is not symmetric , you might need to know well how to apply the right boundary conditions to have a stable BC , the element type not important yet , general question , cause I just heard there is such a book on it
You probably just need a book containing a variety of rather simple examples that would illustrate: how and why this and that boundary condition has been applied, etc. Such books are difficult to come by; you might want to see examples contained in Chapter 6 of the following book (it is devoted to FEA of shells):
I have just learned that the authors published a softcover edition of the same book (but you should probably contact them directly; that edition isn't advertised on amazon).
I think you have a more fundamental issue, not specific to FEA, that is, how good is your knowledge of mechanics? That is where you will derive your boundary conditions.
Do a free body diagram of the problem geometry, this will show you what boundary conditions to apply where.
Admittedly there are some more FEA specifi boundary conditions that will help you to solve a problem, but ultimately they are all found in any mechanics text.
Then you could study an FEA primer such as Daryl Logans book.