What is the meaning of Toolbox?

A storage case for tools.

A set of pre-existing routines for use in writing new programs.

A set of skills or competences

Dumbass or idiot.

a set of auxiliary devices to tackle a set of related problems, e.g. a package of software for a target group or teaching - or marketing aids on a subject

a toolbox (set of routines)

Source: wiktionary.org