nuts and bolts, the

the nuts and bolts

The most basic, fundamental, or essential aspects of something. Japanese is intimidating because of the written characters, but the nuts and bolts of the language are actually pretty straightforward. We came up with a lot of big ideas, but no one addressed the nuts and bolts of how to implement them.
See also: and, bolt, nuts

nuts and bolts, the

The essential or basic aspects of something, as in They have lofty goals but don't specify the nuts and bolts of how to achieve them. This expression alludes to basic working components of machinery. [Mid-1900s]
See also: and, nuts