Lighting your scenes starts with your project's requirements and your own decisions about the look and style you are aiming for. Do you want high-quality realism or simpler geometric rendering? Do you want lifelike objects or cartoon-like graphics? Are you lighting an outdoor scene or an indoor one? Just as important, you also need to ask yourself what are the primary target platforms, especially: is it mobile, desktop, or console? At some point in your projects, before creating the final assets and lighting, you need to figure out your lighting strategy, as Unity recommends:
In this section, I'll try to break down the different types of lighting sources and settings you can use...