Hi @Elisée YAO
I can recommend you to enroll in to online courses related to Jira (created by Atlassian or its vendors). There are also several books on Amazon about Jira written by Atlassian experts (Patrick Li, for example).
We've created a sort of educational portal where we keep up-to-date links related to Jira (Atlassian courses, books, how-to blog posts, YouTube channels). Maybe it can help you.
What’s New as of May 21, 2020 Hi there! We recently made some changes to the way you can leverage Single-sign on and authorization within Opsgenie. Based on customer preference and feedback we intr...
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