In a Tutorial I am watching https://www.youtube.com/watch?v=Ebx2qbBlvh0 Hair Particles are mentioned (15.5 min), Brownian to be exact, but I can´t find them in Blender 3.0. Is that option gone? I want to add some hair to my teddy. What I don´t understand is why later on the Hair BDSF is used.
You have to check Advanced under the particle system to enable additional panes like Rotation and Physics.
The Hair BSDF is a pre-made shader containing the components required to recreate the surface response shown by most hair or fur. Specifically the Hair BSDF contains a reflective and a transmissive component.