Volumetric clouds, low level of sound in fog, luminous beacons, lights, and modified the shade of lights, an improved model of fire and more in this sadaraka
Go to .minecraft/shaderpacks. If folder not exist, create it.
Move or extract shaderpack archive into .minecraft/shaderpacks. You must get following path: .minecraft/shaderpacks/YOUR_SHADERPACK.zip/shaders/[.fsh and .vsh files inside]
Run Minecraft and follow to Settings > Shaders. Here you can see all aviable shaderpacks. Choose one of them
Additionally you can enable "tweakBlockDamage", and disable "CloudShadow", "OldLighting"