Here are a few helpful links to documentaion, videos, and tutorials to help you get started with rendering in Unreal Engine 4.
DOCUMENTATION:
**Lighting**
- [Lighting Quick Start](https://docs.unrealengine.com/latest/INT/Engine/Rendering/LightingAndShadows/QuickStart/index.html)
- [Lighting Basics](https://docs.unrealengine.com/latest/INT/Engine/Rendering/LightingAndShadows/Basics/index.html)
- [Lighting Content Examples](https://docs.unrealengine.com/latest/INT/Resources/ContentExamples/Lighting/index.html)
- [Lighting the Environment](https://docs.unrealengine.com/latest/INT/Engine/Rendering/LightingAndShadows/index.html)
- [Lighting for Mobile Platforms](https://docs.unrealengine.com/latest/INT/Platforms/Mobile/Lighting/index.html)
- [Sky Lights](https://docs.unrealengine.com/latest/INT/Engine/Rendering/LightingAndShadows/LightTypes/SkyLight/index.html)
- [Unwrapping UVs for Lightmaps](https://docs.unrealengine.com/latest/INT/Engine/Content/Types/StaticMeshes/LightmapUnwrapping/index.html)
- [Lightmass Global Illumination](https://docs.unrealengine.com/latest/INT/Engine/Rendering/LightingAndShadows/Lightmass/index.html)
- [Distance Field Ambient Occlusion](https://docs.unrealengine.com/latest/INT/Engine/Rendering/LightingAndShadows/DistanceFieldAmbientOcclusion/index.html)
- [Distance Field Soft Shadows](https://docs.unrealengine.com/latest/INT/Engine/Rendering/LightingAndShadows/RayTracedDistanceFieldShadowing/index.html)
**Materials**
- [Physically Based Materials](https://docs.unrealengine.com/latest/INT/Engine/Rendering/Materials/PhysicallyBased/index.html)
- [UE4 Materials Tutorials](https://www.youtube.com/playlist?list=PLZlv_N0_O1gbQjgY0nDwZNYe_N8IcYWS-)
- [Materials Content Examples](https://docs.unrealengine.com/latest/INT/Resources/ContentExamples/Materials/index.html)
- [Creating Materials and Shaders](https://docs.unrealengine.com/latest/INT/Engine/Rendering/Materials/index.html)
**Particles**
- [Particles Content Examples](https://docs.unrealengine.com/latest/INT/Resources/ContentExamples/EffectsGallery/index.html)
- [Cascade Particle Editor Reference](https://docs.unrealengine.com/latest/INT/Engine/Rendering/ParticleSystems/Cascade/index.html)
- [Key Particle Concepts](https://docs.unrealengine.com/latest/INT/Engine/Rendering/ParticleSystems/Overview/index.html)
- [Particle System Reference](https://docs.unrealengine.com/latest/INT/Engine/Rendering/ParticleSystems/Reference/index.html)
- [Particle System User Guide](https://docs.unrealengine.com/latest/INT/Engine/Rendering/ParticleSystems/UserGuide/)
**Post Process Effects**
- [Post Process Effects](https://docs.unrealengine.com/latest/INT/Engine/Rendering/PostProcessEffects/index.html)
- [Post Process Effects on Mobile](https://docs.unrealengine.com/latest/INT/Platforms/Mobile/PostProcessEffects/index.html)
- [Content Examples: Post Process Effects](https://docs.unrealengine.com/latest/INT/Resources/ContentExamples/PostProcessing/index.html)
- [Post Process Materials](https://docs.unrealengine.com/latest/INT/Engine/Rendering/PostProcessEffects/PostProcessMaterials/index.html)
TUTORIALS:
**Videos**
- [Introduction to Materials in UE4 (Series)](https://www.youtube.com/playlist?list=PLZlv_N0_O1gbQjgY0nDwZNYe_N8IcYWS-)
- [Introduction to Particles in UE4 (Series](https://www.youtube.com/watch?v=OXK2Xbd7D9w&index=105&list=PLZlv_N0_O1gaCL2XjKluO7N2Pmmw9pvhE))
- [UMG UI - Inventory (v4.7)](https://www.youtube.com/playlist?list=PLZlv_N0_O1gZo6zXTHGGSH8gxaA7a_zCt)
- [UMG UI - Inventory (v4.8)](https://www.youtube.com/playlist?list=PLZlv_N0_O1gZalvQWYs8sc7RP_-8eSr3i)
**Wiki Tutorials**
- [Visual Effects: Lessons 01-08 (Series)](https://wiki.unrealengine.com/Visual_Effects:_Lesson_01:_Material_Particle_Color)
- [Video Scanline Post Process Effects Tutorial](https://wiki.unrealengine.com/Video_Scanline_Post_Process_Effects_%28Tutorial%29)
- [Material Tutorials](https://wiki.unrealengine.com/Category:Material)
- [Particle Tutorials](https://wiki.unrealengine.com/Category:Particle)
BLOG POSTS:
- [Art Blog Posts](https://www.unrealengine.com/blog?category=Art)
- [Unreal Property System (Reflection)](https://www.unrealengine.com/blog/unreal-property-system-reflection)
- [Striving for Real-Time Photorealism](https://www.unrealengine.com/blog/striving-for-real-time-photorealism)
- [Building Unreal Paris](https://www.unrealengine.com/blog/building-unreal-paris)
TWITCH STREAMS:
- [Unreal 4 Rendering](http://www.twitch.tv/unrealengine/c/4084312)
- [Subsurface Scattering and Ray Traced Soft Shadow Demos](http://www.twitch.tv/unrealengine/b/578758490)
- [Using Material Effects](https://www.youtube.com/watch?v=enx6ShyKUL8&index=10&list=PLZlv_N0_O1ga0aV9jVqJgog0VWz1cLL5f)
- [Material and Particle Interaction](https://www.youtube.com/watch?v=YZ3TIqwqOWY&list=PLZlv_N0_O1ga0aV9jVqJgog0VWz1cLL5f&index=12)
If there is some specific information related to rendering that you feel is missing from our documentation or tutorials, please let us know by creating a post in the Feedback section. Thanks!