Unreal Engine 4.26 Documentation [updated] -

The is more than just a manual; it is a map of the engine's logic. Whether you are looking up the parameters for a LineTraceByChannel , trying to optimize your Shader Compilation, or fixing that pesky "Cascade to Niagara" conversion error, the official docs are your primary tool.

For filmmakers, the 4.26 technical notes emphasize professional-grade output and onset efficiency. Unreal Engine 4.27 Release Notes - Epic Games Developers unreal engine 4.26 documentation

docs.unrealengine.com/4.26