Check out example codes for "get player pawn". It will help you in understanding the concepts better.
Code Example 1
//file to include #include "Kismet/GameplayStatics.h" //Syntax static APawn * GetPlayerPawn(const UObject * WorldContextObject, int32 PlayerIndex); //ExampleCode APawn* PlayerPawn = UGameplayStatics::GetPlayerPawn(GetWorld(), 0); // this is a reference to world | This is the index of player which you want. In this case have written 0 that means the first player //For more information vist https://docs.unrealengine.com/en-US/API/Runtime/Engine/Kismet/UGameplayStatics/GetPlayerPawn/index.html
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