More like Introduction (Alien Emergencies)

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ThistledownSeries
series5 books1978
completed
Hard science fiction.
Start with The Wind from a Burning Woman →
Children of TimeSeries
series6 books2015
Science fiction, set in far future and other star systems.
“The two threads collide across mismatched timescales as the ark ship's crew, cycling in and out of cryosleep, finally reach the spiders' world.”
from the catalogue
Start with Children of Time →
CoDominiumUniverse
universe98 books1971
Military science fiction.
“The body of work runs along a few hard threads rather than one line.”
from the catalogue
Start with The Mote in God's Eye →
includes Moties, War World, Falkenberg's Legion, Laurie Jo Hansen
Blindsight / FirefallSeries
series3 books2006
Hard science fiction, tense and dark in tone, about artificial intelligence.
Start with Blindsight →
The Gods ThemselvesNovel
Isaac Asimovstandalone novel1972
Hard science fiction, set in parallel universe and the moon.
Starship TroopersNovel
Robert A. Heinleinstandalone novel1959
Military science fiction, adventurous in tone, about war and coming of age.