Two kinds of trigger
Schedules run once, daily, on weekdays, weekly or monthly in your site timezone, queued by WP-Cron. Hook triggers fire on a WordPress action — content, comments, users, plugins, themes, media or options — so work happens when something actually changes.
- Once, daily, weekdays, weekly, monthly
- Curated WordPress hooks, plus custom hooks
- Request-lifecycle hooks are deny-listed for safety
- Occurrence deduplication prevents double runs