Take a look at Atlassian University's Jira Project Administrator learning path:
https://training.atlassian.com/learning-paths/jira-proj-admin
Managing Jira Cloud Projects and Project Administration in Jira Server both come as Certification Bundles.
If you're new to Jira, start with Jira Essentials with Agile Mindset.
Let us know of further questions!
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