So what I want to do is to change block to another after right clicking it with an item, but I have no idea how I can check what block player is right clicking and how to change block into another

 

you can also use the onBlockActivated method from your block class, and check what item the player is holding.

Or you can use the onItemUse method from your item class, and check what is the block the item is being used on.

 

This may be better than listening to the event, because then you're only running code when your item is used or when your block is right-clicked, not on every player Interaction