These were three of the most common types;
Pageview Hits,
Event Hits,
Transaction Hits,
Pageview hit is triggered when users load a web page with tracking code. This is the most common type of hit.
Event hit is a hit type that records every communication a user has with a particular element on the website. For example, you can track whether users click the Buy button here.
Transaction hit transmits information about purchases, such as purchased products, transaction IDs, and inventory holding units, to Google Analytics.