What staging is actually for
Not perfection — a place where breaking something costs nothing. Most of the value comes from catching plugin conflicts and failed migrations before customers meet them.
Keeping it honest
Staging that has drifted from production tests nothing. Refresh it from a production backup regularly, and scrub personal data when you do.
Stop search engines indexing it
Password-protect the directory or return a noindex header. Duplicate staging content competes with your real site in search results and is awkward to remove afterwards.