Add and augment conceptual docs #2287

Job	Run time
build (windows-latest, Debug)	9m 14s
build (windows-latest, Release)	11m 48s
build (macos-latest, Release)	6m 56s
build (ubuntu-latest, Release)	6m 10s
build (macos-latest, Debug)	9m 9s
build (ubuntu-latest, Debug)	6m 46s
publish-coverage	0s
	50m 3s

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