Learn mainframe, z/OS and Linux for Z on a shoestring. Let me know if you have any updates or additions to the list. Introduction Here's What Happens When an 18 Year Old Buys a Mainframe https://www.youtube.com/watch?v=45X4VP8CGtk&t=94s z/OS introductory video course http://www.redbooks.ibm.com/redbooks.nsf/redbookabstracts/crse0304.html?Open The ABCs of System Programming redbooks http://www.redbooks.ibm.com/abstracts/sg246981.html?Open IBM z/OS Basic Skills page in Knowledge Center.  https://www.ibm.com/support/knowledgecenter/en/zosbasics/com.ibm.zos.zbasics/lcmain.html Introduction to the new mainframe http://www.redbooks.ibm.com/abstracts/sg246366.html?Open RelevantZ site http://relevantz.ibmsystemsmag.com/ibm-systems-relevant-z IBM Z Youtube IBM Z YouTube channel Love mainframe https://lovemainframe.com/ Open source initiatives Zowe https://www.openmainframeproject.org/ Free training offers Cross-technology z/OS Introduction and Workshop http://dtsc.dfw.ibm.com/MVSDS/'HTTPD2.APPS.ZOSCLASS.SHTML(ZOSCLASS)' Master the mainframe: https://www.ibm.com/it-infrastructure/z/education/master-the-mainframe Free training at HPI https://open.hpi.de/courses/mainframes2018 Many tutorials on Mainframetechhelp https://www.mainframestechhelp.com/ Tutorialspoint on mainframe https://www.tutorialspoint.com/mainframe_tutorials.htm Mainframe Playground  https://mainframeplayground.neocities.org/ TSO/ISPF Introduction to TSO/ISPF https://www.tutorialbrain.com/mainframe/tso_ispf/ JCL Introduction to JCL https://www.tutorialbrain.com/mainframe/jcl_pgm_parameter/ JCL course https://www.tutorialspoint.com/jcl/jcl_job_statement.htm COBOL Introduction to COBOL https://www.tutorialbrain.com/mainframe/cobol_home/ Free COBOL course from CSIS http://www.csis.ul.ie/cobol/course/ Mainframe playground on COBOL https://mainframeplayground.neocities.org/COBOL.html Books (search for 2nd hand versions) Teach Yourself COBOL In 21 Days Murarch’s Mainframe COBOL CICS Introduction to CICS http://www.redbooks.ibm.com/abstracts/crse0303.html?Open Db2 for z/OS DB2 for z/OS: Data Sharing in a Nutshell Introduction to Db2 z/OS (for programmers) - https://www.tutorialbrain.com/mainframe/db2_tutorial/ MQ for z/OS MQ on z/os concepts https://www.ibm.com/support/knowledgecenter/en/SSFKSJ_8.0.0/com.ibm.mq.pro.doc/q003590_.htm http://share.confex.com/data/handout/share/131/Session_23611_handout_11867_0.pdf VSAM Introduction to VSAM https://www.tutorialbrain.com/mainframe/vsam_tutorial/ Assembler Assembler training https://punctiliousprogrammer.com/ibm-mainframe-assembler/ Developer topics IBM System z Tech Video’s IBM Z Systems tech zone Application Discovery ADDIApplication Delivery Foundation for z Systems ADFzzD&T - mainframe for hobiests on your Intel machine zD&T Access to real mainframe Unfortunately there is no Community mainframe yet. How cool would that be.  There is the emulator solution zD&T on which you can run z/OS legitimately (warning: quite cumbersome, slow and expensive.) IBM Z trials https://www.ibm.com/it-infrastructure/z/resources/trial Gives you 3 days access to a trial environment with scripted tutorials.. When you have a software development company, or if you are rich: Remote development programme on Dallas System z http://dtsc.dfw.ibm.com/MVSDS/'HTTPD2.ENROL.PUBLIC.SHTML(ZOSRDP)' (Will cost you something like $550 USD per month.)