There is more and more interest in publications that can be used by students or professionals starting on the mainframe. A good introduction to the mainframe and its operating systems provide our IBM Redbooks.
I would start with the "Introduction to the new mainframe" books. This series of books is available for z/OS, z/VM, z/VSE, Networking, and Security.
In between those books are some years old, but still relevant, if you are new to the mainframe.
If you are reading my blog, I would assume you are mainly interested in... [More]