gists
Hearts of matters
Gists are the essential points or central meanings of something: I didn't read the whole report, but I got the gists of the main arguments.
The plural is relatively uncommon since gist typically refers to a singular essence—you grasp the gist of a conversation, not usually multiple gists.
When pluralized, it suggests distinct core ideas from separate sources or sections.
core
Central essential portion
nub · pith · substance · marrow · meat · soul · quintessence · nucleus · root · thrust
synopsis
Condensed version of content
outline · digest · précis · condensation · rundown · briefing · sketch · capsule · roundup · compendium
gistsdetails
Specific pieces of information
specifics · particulars · minutiae · elaborations · nitty-gritty
giststrivia
Unimportant miscellaneous facts
peripherals · tangents · digressions · asides · side notes