All Triggers are on this page. You can also create new Triggers.
Write Trigger Name, Note, Send to users in this segment, Template to send
You can send the trigger once
Set it for a repeated delivery by Daily and hours and minutes
or by a monthly and set date, Hours and Minutes
or by Weekly and set Week of days, hours and minutes
Or by yearly and set Month, Date, hour and minute
And also set multiple dates
This is how the triggers work.