I've seen numerous requests around 'how do I get started' with Atlas and Open Metadata. Here's a suggest path:
Learn
Want to find out
Hopefully you find the content here useful. If you would like to make suggestions for improvement, or even better ask to contribute more content, simply ask on the dev list above.
A good starting point is the introduction to Open Metadata
Discuss
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The most important aspect of any Apache project is collaboration, so an essential starting point is to join the relevant Atlas mailing lists
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Finally when interacting with the mailing list, note that the EZLM mailing list server doesn't support all mail formats. In particular it has a dislike to HTML only email, so try to send a plain text (text/plain) or at least in multipart. Generally gmail, outlook, lotus notes seem fine, but IBM verse will fail and posts simply get ignored as they are not posted.
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Do: Write, design, code, test
The Atlas JIRA is where issues are tracked. A new issue can be opened if you find a bug or hit a problem with Atlas, and this is also one way - in addition to the list - of finding out what code changes are being proposed or going in. Any design discussions will probably be oriented around a specific JIRA and may link to locations on this wiki, include design docs etc. No permission is needed to open a JIRA account, but if you wish to assign an issue to yourself to work on, please ask in the dev list for contributor authority.
Wiki
Hopefully you find the content here useful. If you would like to make suggestions for improvement, or even better ask to contribute more content, simply ask on the dev list above.
A good starting point is the introduction to Open Metadata