Try this page,
and the next pages after it discussing the ambient, directional, hemisphere, point, spot, and different types of shadows. The pages have working examples with guis.
Your example images look like the materials are using flatshading, and the light is directional (ie, not a point), with the directional shadow. The top image appears to be using the orthograhic perspective.
The objects may also be using the MeshToonMaterial with about 7 tones. https://sbcode.net/threejs/meshtoonmaterial/ although you could get that effect with most of the other materials.
The bottom image appears to be using a post processing shader of some sort for the blur. Perhaps its the depth of field shader used here. https://threejs.org/examples/?q=post#webgl_postprocessing_dof