Gulp was the JavaScript-based task runner that succeeded Grunt in the 2014-2017 window for build pipelines, asset processing, and CI scripting. Most of what Gulp did has migrated into bundler integrations (Vite, Rollup, esbuild) or been absorbed by framework build pipelines (Next.js, Nuxt, Astro) that don't expose a separate build orchestrator.
Courses in this category are mostly maintained for legacy projects. New work rarely picks Gulp; if you're onboarding to a codebase that uses it, the courses cover what you need to read existing gulpfile.js tasks and incrementally migrate them.