The Atlassian Community Forums are currently in read-only mode. We will be relaunching on a new platform on September 22 (read more here). We apologize for the extended downtime. For concerns or questions, please email communitymanagers@atlassian.com. See you on the other side, on the new Atlassian Community Forums! :)
If you are new to Atlassian ecosystem, I would suggest you to start with Jira. Again, all depends on what you want to learn and what your organization is presently using.
