When adding hair to an armature 3D model, using a bone-integrated hair system (like Blender’s Particle Hair or Maya’s XGen) is the best way—it ensures natural movement with the model’s poses.
This works because the system uses the armature’s bone weights to follow vertex deformation—you can paint weights to control which bones affect strands, then use grooming tools to style length, thickness, and direction.
For beginners, start with Blender’s Particle Hair (set to “Hair” type, linked to the armature). Use weight painting to limit hair to areas like the scalp, and test small sections first to learn how bones influence movement.