Questions about 2D lights

Hey, I am trying to make 2d platformer game and i would want that everything affects to light level, So i like to have answer for these questions:

  1. What is diffrent with DefaultLitSprite Material, maskedLitSprite Material, TranslucentLitSprite Material and OpaqueLitSprite Material?
  2. What is best at like buildings and what is best for nature things?

Thanks for answers.