Check out example codes for "no overload for 'useItemOnSceneLoad' matches delegate 'UnityAction<Scene, LoadSceneMode>'". It will help you in understanding the concepts better.

Code Example 1

//https://answers.unity.com/questions/1279397/onscenewasloaded-deprecated-cannot-find-work-aroun.html
//The two problems you have is sceneLoaded is a delegate with two parameters, 
//where you provide none with your myDelegateEvent() method. you need to extend your myDelegateEvent 
//to match the parameters like:

 void myDelegate(Scene scene, LoadSceneMode mode){  }

//then use:
SceneManager.sceneLoaded += myDelegeteEvent;
//to add an event to the delegete

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