toolkit
A set of tools or skills used for a certain job.
A toolkit is a collection of tools kept together for a specific purpose. Your dad might have a toolkit in the garage filled with hammers, screwdrivers, and wrenches for fixing things around the house. A dentist has a toolkit with specialized instruments for examining teeth.
The word has expanded beyond physical tools to describe any set of resources or methods used to accomplish something. A teacher might develop a toolkit of strategies for helping students learn difficult concepts: different ways of explaining, various practice activities, and techniques for keeping everyone engaged. A scientist uses a toolkit of methods to study problems: experiments, measurements, calculations, and observations.
When someone says they're adding a skill to their toolkit, they mean they're learning something useful they can use later. Reading comprehension, basic math, and clear writing form an essential toolkit for school success. Learning to listen carefully, ask good questions, and work with others creates a toolkit for friendship and teamwork.
The idea behind toolkit is that having the right tools ready makes any job easier. A carpenter with a good toolkit can build almost anything. A student who develops a strong mental toolkit of skills and knowledge can tackle increasingly difficult challenges with confidence.