Hi Pujan!
Check out Misty's blog post on some getting started resources: https://community.ibm.com/community/user/ibmz-and-linuxone/blogs/melissa-sassi1/2020/03/17/how-to-get-started-on-ibm-z?CommunityKey=27b746cd-ca36-49bb-a1ad-01e7aec7d9aa&tab=recentcommunityblogsdashboard
Also, the first two levels of MTM teach A LOT, so get ready to learn there :)