There are many good courses on our university which you should go through . Personally I have learned Mainframe myself watching this video if that helps
🙂 :https://www.youtube.com/watch?v=HLFwvzgZtiY
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Vipul Tiwari
Senior Process Simplification and Optimization Designer(Solutions Architect)
Fidelity International
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Vipul Tiwari
Senior Process Simplification Developer
Amazon
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