UE4 recommended folder structure

Folder	Content Type
Content\Maps	parent maps folder
......... Maps\Episode(_Number)	game episodes, where (_Number) is 01, 02, 03, etc
......... Maps\TestMaps	test maps, maps prototypes and other levels not for production
Content\Base	basic materials, material functions and other "foundation" assets
Content\Characters	folder for characters
......... Characters\NPC	NPCs
......... Characters\Player	player character(s)
Content\Dev	development assets, like objects icons, special meshes and textures, etc
Content\Effects	various shared effects
Content\Environment	environment assets
..........Environment\Background	backgrounds
..........Environment\Buildings	buildings (simple or procedural)
..........Environment\Foliage	foliage
..........Environment\Props	various props
..........Environment\Sky	skies
..........Environment\Landscape	terrains assets
..........Environment\Water	water meshes and materials
Content\Gameplay	assets for various gameplay purposes
Content\PostProcess	post process chains and it's assets
Content\Sound	sounds and sound cues
Content\UI	UI assets
Content\Vehicles	vehicles with effects
Content\Weapons	weapons with effects

Folder

Content Type

Content\Maps

parent maps folder

......... Maps\Episode(_Number)

game episodes, where (_Number) is 01, 02, 03, etc

......... Maps\TestMaps

test maps, maps prototypes and other levels not for production

Content\Base

basic materials, material functions and other "foundation" assets

Content\Characters

folder for characters

......... Characters\NPC

NPCs

......... Characters\Player

player character(s)

Content\Dev

development assets, like objects icons, special meshes and textures, etc

Content\Effects

various shared effects

Content\Environment

environment assets

..........Environment\Background

backgrounds

..........Environment\Buildings

buildings (simple or procedural)

..........Environment\Foliage

foliage

..........Environment\Props

various props

..........Environment\Sky

skies

..........Environment\Landscape

terrains assets

..........Environment\Water

water meshes and materials

Content\Gameplay

assets for various gameplay purposes

Content\PostProcess

post process chains and it's assets

Content\Sound

sounds and sound cues

Content\UI

UI assets

Content\Vehicles

vehicles with effects

Content\Weapons

weapons with effects

Folder	Category
Blueprints	blueprints
Meshes	static and skeletal meshes, physical assets
Materials	materials and instances
Textures	textures
Animations	animations
Particles	particle systems
LensFlares	flares
Sounds	sounds + cues
Morphs	morphs
FaceFX	FaceFX assets

Folder