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Re:Has Mainframe Computing Inadvertently Started Its Own Cul... by lboc on Wednesday May 25, 2022 @05:12AM (#31502122)
zxplore is a free z/OS course (what used to be called 'Master the Mainframe'):

https://ibmzxplore.influitive.com/users/sign_in

Also a bunch of free courses here:

https://learn.ibm.com/

(free registration required)

(EDIT) If you're in the US and meet the requirements (take free courses) you might also be interested in this for (I believe) $120/year:

https://ibm.github.io/zdt-learners-edition-about/

Email in profile if you want to know more.

Re:Has Mainframe Computing Inadvertently Started Its Own Cul... by treesknees on Wednesday May 25, 2022 @08:15AM (#31503412)
Thank you, I will take a look at those.