Particles
A ParticleSystem emits small squares that face the camera, move, fade and die: smoke, sparks, dust.
Settings

Every field is listed in Components.
Colours above 1 bloom.
Tuning
Particles play while you edit, so a system can be tuned by eye in the viewport.
From a script
A common pattern is a prefab with a system that does not loop and has one burst. A script places it where something happened and destroys it a second later:
Colours are set as a Vec3 with how solid they are beside them: