Beginner
Intermediate
This tutorial shows how to make your landscape look more natural. He creates masks for the factors of mixshaders that define the near, mid, and far areas. Then he changes the scale of the texture he is using for the ground. He also shows how to use a masks for the mountains.
Blender is a powerful program and if you don't have a fast enough rig, you won't be able to do the things you really want to. Forget about simulations, or large scenes.
Get 32gigs of ram or more, (ddr5 ram just dropped in price), Get a VideoCard with 12gb of vram or more, get a large M.2 drive, and an 8 to 16core Processor.