Colour Versus Luminosity Blend Modes by f64 Academy - Article, YouTube,
The Blending Modes
Pass Through - This is the default Blending Mode for a Group when it is created. It causes effects in that group to apply to layers below it. If this is changed to Normal, then the group becomes totally self contained, so that things like clipping masks may no longer be needed. 01,
Normal - The default mode.
------------- These darken the image
Multiply - Everything that is white becomes transparent, and black remains.
Colour Burn - See Dodge and Burn
------------- These lighten the image
Lighten - Lets things that are lighter show up from the layers below.
Colour Dodge - See Dodge and Burn
Linear Dodge (Add)
------------- These increase contrast
Overlay - Deletes everything that is 50% grey. Painting with black or white removes greys.
Soft Light - A softer effect
Hard Light - A harder effect and can change colours.
------------- These only appear in certain modes -