Simple summary of lighting usage

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It is most direct to read the official documents first
https://docs.unity3d.com/Manual/LightModes.html

Global Illumination

• GI It deals with indirect light (indirect light) Lighting technology , Not opening means Unity Not dealing with indirect light at all .

• GI take Static Indirect illumination information baking of objects ( Precomputation ) To Lightmap in , Dynamic objects can use light probes To store information about indirect light .

• Use Mixed / Baked Mode when , Must enable Baked GI, Otherwise, it will be regarded as Realtime Lights Handle . The reason is to close GI Will not bake Lightmap , And these two modes are important for Static Most objects need baking Lightmap.Mixed Light Depending on the sub patterns , There will be different ways of handling , See the table below for details .

Lighting Modes with GI

The following figure illustrates the differences completely Lighting Mode coordination GI When dealing with direct and indirect light ,Mixed And Baked Lights Must enable GI Can be used , So there is no separate line .