nitty-gritty Synonyms

kernel nub meat marrow inwardness heart gist essence core centre center substance pith central core foundations main point sum and substance name of the game essentials essential part heart of the matter central theme practical details basic details cold fact truth of the matter basic parts get down to brass tacks Central Point nuts and bolts crux basis nucleus point quintessence sum ABCs first principles basics fundamentals heart and soul meat and potatoes bottom line burden