Below, is a list of some sections I have encountered with some examples of species. That is VERY FAR from exhaustive
One website to check which section the Dendrobium belongs to is
http://www.orchidspecies.com/
The book is
Orchids species culture - Dendrobiums by Baker and Baker - Timber press
The website to buy culture sheets by the piece for $1 is:
https://www.orchidculture.com/
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Some sections I have encountered:
Section Callista: needs extended dry rest in winter to bloom properly. Medium bright light. Will take low temperatures at night.
lindlyei (syn. aggregatum), thyrsiflorum, jenkensii, chrysotoxum etc...
Section Spatulata (Antelope): no rest, plenty of water year-round, cold intolerant, high light
Spatulata from New-Guinea: antennatum, gouldii, stratiotes, stebloceras, tangerinum, lasianthera, lineale, mirbelianum, sylvanum, violaceoflavens etc...
Spatulata from Australia: canaliculatum, carronnii, undulatum (also called discolor) affine, bigibbum, phalaenopsis etc...
Hybrids usually sold in this section in the US.
Section Latouria: easy care, no rest, moderate watering, high light, can take low temperatures
atroviolaceum, normanbyense etc... Mostly hybrids sold in the US.
Section Dendrobium: extensive dry rest
anosmum, friedericksianum, unicum and many more
Section Breviflores: strong reduction of watering in winter, medium light
hercoglossum, linguella etc...
Section Calcarifera:
amethystoglossum, Victoria-Regina etc...
Section Pedilonum:
bullenianum, goldschmidtianum etc....
Section Dendrocoryne (Australian hard canes): extensive dry rest and low temperatures in winter needed for proper flowering
speciosum, fleckeri, tetragonum etc...
Section Rhopalante: many small flowers, short-lived. water year-round
faciferum, crumenatum etc....
Section Calyptorichilus:
aemulum, lawesii etc..
Section Formosae:
lowii etc...
Section Dockrilla:
linguiforme etc...
Past videos of mine on some Dendrobiums:
Den. anosmum: (Section Dendrobium)
https://www.youtube.com/watch?v=03XxNSNg2XQ&t=7s
Den. lindleyi: (Section Callista)
https://www.youtube.com/watch?v=EEnqDaG4PIU&t=7s
Antelope Dendrobiums: (Section Spatulata)
https://www.youtube.com/watch?v=uVzvZI1RygI&t=16s
https://www.youtube.com/watch?v=NBQ3NFWCu30&t=6s
Den. hercoglossum (Seciton Breviflores)
https://www.youtube.com/watch?v=t1WxwhF_3T8&t=61s