The Merge Nodes

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Compositing would not be compositing without layering. The merge menu is where all the layering nodes can be found.

The nodes

AddMix

KeyMix

ContactSheet

LayerContactSheet

Merge

TimeDissolve

Premult and Unpremult

Switch

Other

Merge Blend Modes
The many ways that two layers can be merged together:
Primacy of the B Feed
What B feed primacy is and why it is important (also mentioned here).
Bounding Box and Black Outside
This address the region outside of the frame and what happens to it when layering is required. A bit obscure, but necessary.
Format Workflow
The format workflow explained.
Alpha Channel
Alphas, mattes, masks explained.