More like Know Thy Enemy

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Known SpaceUniverse
universe142 books1964
About aliens.
“Give a clever species a few centuries and a working fusion drive, and it will fill the sky with problems.”
from the catalogue
Start with Ringworld →
includes Man-Kzin Wars, Ringworld, Fleet of Worlds
Forever WarSeries
series10 books1972
Science fiction and military science fiction, set in far future and space.
Start with Hero →
Old Man's WarSeries
series16 books2005
Military science fiction and science fiction, adventurous in tone, about war, set in far future and space.
“Sign a document at 65, saying you intend to join up 10 years later.”
from the catalogue
Start with Old Man's War →
Starship TroopersNovel
Robert A. Heinleinstandalone novel1959
About coming of age and aliens.
Ender's GameUniverse
universe39 books1977
Science fiction, set in far future.
“To beat your enemy you must first understand him so completely that you love him — and in the instant you love him, you destroy him.”
from the catalogue
Start with Ender's Game →
includes Ender Wiggin, Ender's Shadow, First Formic War, Second Formic War, Fleet School
HonorverseUniverse
universe83 books1993
Science fiction and military science fiction, set in far future and space.
“At the center stands one officer, Honor Harrington — captain, then something far larger — and the six-limbed empathic treecat who rides her shoulder.”
from the catalogue
Start with On Basilisk Station →
includes Honor Harrington, Saganami Island, Worlds of Honor anthologies, Wages of Sin, Manticore Ascendant, Expanded Honorverse, Honor Harrington Universe short fiction, Star Kingdom (Honor Harrington)