essentials
n. countablen. the most important things you need for a specific situation or activity. You use this when talking about basic items like food, water, or tools that you cannot do without.
n. the fundamental or indispensable elements of a situation, activity, or collection. Plural in form; refers to the core requirements necessary for survival or success.
We packed only the essentials for our weekend trip.
Before starting the project, the manager made sure everyone understood the essentials of the new safety protocol.
While the luxury features of the vehicle are impressive, the design team focused primarily on the mechanical essentials to ensure reliability in harsh desert conditions.
Almost always used in the plural form ('essentials') when referring to physical items or basic principles.