Synonyms of 'nuts and bolts'
▷ See nuts
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The fundamentals of something are its simplest, most important elements, ideas, or principles, in contrast to more complicated or detailed ones.
teaching small children the fundamentals of road safety
sine qua non
If people get down to the nitty-gritty of a matter, situation, or activity, they discuss the most important, basic parts of it or facts about it.
They are more concerned with matters of principle than with the nitty-gritty of everyday politics.
Thesaurus for nuts and bolts from the Collins English Thesaurus
If you talk about the nuts and bolts of a subject or an activity, you are referring to the detailed practical aspects of it rather than abstract ideas about it.