Some content will be marked as spoilers. By default spoilers are visible. You can hide them per-wiki using Wiki Preferences.

Progressively show spoilers

You can gradually reveal spoilers as you play a game and complete entities. Choose the "Progressively show spoilers" option under Wiki Preferences.
For more information on how spoilers work, see Configure Spoilers.
Spoilers are flagged and maintained by the community. Unless if the wiki says so, do not rely on them to keep spoilers out of sight.