Custom item drops

    I am relatively new to minecraft modding and I have a few questions:

    To add additional drops from a block (i.e. Having them to drop "regular" drops as well as other items occasionally), instead of overriding the methods of Block class, what is the "proper" way of doing this?

And similarly, I assume there's also a much preferred way to add custom drops to mobs other than using event listeners.

    I would really appreciate your help and suggestions. Thanks a lot!