A precise report is usually fixed in one pass; a vague one needs two or three rounds of follow-up questions. Whatever your topic, always include the page URL you are talking about. Then add the specifics below:
For marker corrections: region (Olympus, Styx, Prometheus or Elysium), cave ID such as R-17 or grid coordinates, what is wrong (misplaced, missing, wrong label), and a screenshot with the in-game position visible when possible.
For bug reports: page URL, browser and version, desktop or mobile, exact steps to reproduce, what you expected, and what happened instead — plus a screenshot or short screen recording for visual bugs.
For feature ideas: which page it concerns, the problem you hit while prospecting, and what the ideal behaviour looks like. Links to similar implementations help.
For privacy or rights requests: the email address you originally used (for privacy threads), the page URLs concerned, a clear description of the request, and — for rights-holders — evidence that you own or represent the content.