About the event system

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I am new to `java`, `idea`, `gradle` and I am learning to write `forge`.
I followed the official documentation and came across the `event system` and have some doubts about how I should know what events I should use.
Suppose: Steve drops an item, how do I know what event to use and the name of the event call without a cross reference.
Or, does `forge` have a cross-reference list of events
The entity picks up an item, and newbies can tell by the cross-reference list that

public void pickupItem(EntityItemPickupEvent event) 

represents the pickup of an item.