nuts and bolts

• Expression informelle désignant les aspects concrets, pratiques ou fondamentaux d'une chose, en particulier le fonctionnement d'un système, d'un processus ou d'un mécanisme.

An informal expression referring to the basic, practical, or fundamental details of something, especially how a system, process, or machine works.

1. Basic practical detailsB2informal

   The fundamental, practical, or essential aspects of a subject or activity.

   les aspects pratiques essentiels

   • He explained the nuts and bolts of how the engine works.
   • Before you start, you need to understand the nuts and bolts of the software.
   • The course covers the nuts and bolts of business management.