How to create particles effects

1. Add a GPUParticles3D node in your scene
2. In the Inspector on the right, under Draw Passes, select a shape for your particles. Also add a material for the shape

3. Under Process Material, add a new ParticleProcessMaterial

4. This should lead to a minimal starting point for particles. When you see the particles appear in the scene, configure the different properties until reach the effect you want