How to track tasks which are not relevant to any epic or stories in Jira Like code review, Reporting,etc?
It very much depends on what you mean by "track". Jira is an issue tracker, so any issue you put into it is tracked.
A lot of people using Jira track a lot of their stuff outside Epics and Stories - they create issues of other types or issues that are not linked to Epics. Even my own example - our main Jira system is used for almost everything, and a very quick search for "epic link is empty" returns 97% of the issues that we're tracking in there.
So, I think the question is "what are you wanting to "track"?"
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