It's include several demonstration examples of how to customize the rendering pipeline under unity SRP.
The topic:

• ManualPipeline(customize your render pipeline without SRP)
• CustomSRP(customize your render pipeline with SRP)
• ExtendURP(use a outline example to show how extend URP)
• CustomURP(use far away fade out skybox demo to show how desing your renderer to replace URP default ForwardRenderer)
• ReflectionWithURP(how to extend plane reflection effect with URP)
• Other examples