z/OS operating system: Providing virtual environments since the 1960s
z/OS storage constructs: File systems, data sets, and more
Interacting with z/OS: TSO, ISPF, and z/OS UNIX interfaces
Processing work on z/OS: How the system starts and manages batch jobs
Doing work on z/OS: How you submit, control and monitor jobs using JCL and SDSF
Parallel Sysplex: Worth the effort for continuous availability