4.1: Basic Landscape.
Creating a Landscape on Blender Tutorial: Creating a Low Poly Scene (Blender Made Easy)
4.2: Hilly Meadow Landscape.
Be cautious on how much grass / particles that you place.
Making a Grassy Meadow: Grassy Meadow (Blender Guru)
Creating a Landscape using ANT Landscape: Realistic Terrain -- Part 1 (Remington Graphics)
Creating a Custom Landscape on Blender Tutorial: Blender Terrain Mesh Tutorial (raven67854)
Creating God Rays in Blender. www.youtube.com/watch?v=yztdEwLIEFI
Creating Volumetric Fog in Blender. https://www.youtube.com/watch?v=uP1-90H0Ytg
Super Easy Fog in Blender. https://www.youtube.com/watch?v=qbMJ4Kts-LI
4.3: ANT Lakeside Landscape.
Be cautious with how many trees and rocks that you place.
Lakeside Landscape: Lakeside Trees (Sardi Pax)