Blender 3D consulting

I've video, captured from Blender. (the home work in univercity of my girlfriend). I need consulting about some values and parameters of the Blender, which were setting up in the process of creation cup and influent with steam. Could you, please, give the short answers to questions (why we are using it, what does it mean (parameter and/or it's value))... Cup 1. Why in Modifier we should set levels in 2 ? 2. Why we need the Shaders menu? 3. What does the Toon mean ? 4,5. What does the Fluid-> Obstacle mean and then Fluid-> Shell? Fluid: 6. For the circle, which is the source of fluid - what is the Fluid -> Inflow -> Shell mean ? 7. Why after these parameters we are choosing x: -0,10 ? 8. For the cube: Fluid -> Domain 9. Reolution: 80 Prev-Res: 50 10. Bnd tab. 11. Part -> PartShipAmount: 0, 300 =? 12. Par tab 13. Tracer Particles: 1 ? 14. Why we are choosing Mirror transp. while the material defining ? 15. Ray mirror 16. In the Shaders Tab: why parameter Cook to set the next options: Spec: 0.41 Hard: 117 17. In the menu Physics: Basic: Amount = ? 18. Random = Normal. - what does it mean ? 19. In Render section: Pipeline -> Halo ?