You probably want to check out Atlassian Automation. The basic documentation is here:
https://support.atlassian.com/cloud-automation/docs/jira-cloud-automation/
Atlassian also has training you can take:
https://university.atlassian.com/student/page/815398-jira-automation-course-description?sid_i=2
I also wrote an article recently with some tips and tricks when getting started:
https://community.atlassian.com/t5/Jira-articles/Automation-Basic-Tips-and-Tricks/ba-p/2032455
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