System Z Management blog is growing! See this great Redbook on z/OS basics
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Checkout this well written and outlined publication that provides students of information systems technology with the background knowledge and skills necessary to begin using the basic facilities of a mainframe computer. It is the first in a planned series of book designed to introduce students to mainframe concepts and help prepare them for a career in large systems computing.
Explore this revised IBM Redbooks publication, Introduction to the New Mainframe: z/OS Basics