hy.
what kind of matrixes you advise me to use with DirectX 11?
I saw that exist and are used in the tutorials XMMATRIX, what are they?
However, i don't find the dot product and cross product for these matrices.
Thanks.

XMMATRIX is a type from XNA Math library. If you wish to use it as it is supposed to be used, that is by compiling it with SSE intrinsics, you will have to take care of proper memory alignment of XMMATRIX. It is a little bit more complex topic, so take a look at docs. Also, both dot product and cross product operations definitely exist in XNA Math library, as well as many many other useful functions.

click and scroll down to the "Porting from D3DXMath" section it lists all of the XNAMath functions as well as their equivalent to D3DXMath