Trigger marketing can be mainly classified into 4 major types. They are as follows:
1. Behavior based triggers: Collecting data by tracking customers online behavior and activities.
2. Engagement based triggers: They help you increase engagement on your website by making consumers curious about your website and increase conversion rate.
3. Event based trigger: Inspires customer loyalty and makes customers do repeat business with you.
4. Emotional trigger: Emotional triggers are emotionally connecting cutomers to an advertisements.
Here https://www.feedough.com/trigger-marketing-everything-you-need-to-know/ is an article to help you with the topic.