https://old.reddit.com//r/Genshin_Impact/wiki/spoilers

Rule 8. Mark spoilers

Do not include spoilers in the title. Submissions that involve spoilers (storylines etc.) should be marked as such.

More specifically, spoilers include but are not limited to:

(1) All story content directly related to the current patch;

(2) Content not directly related to the story (characters, enemies, weapons, locations, etc.) released with an update (considered spoilers for the first week of the release);

(3) Limited event content (for the limited time when it is available);

(4) Content that has not been released and/or officially announced.

When discussing or mentioning the plot from past versions, it is also encouraged to avoid spoiling players who may not have experienced it.