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Bootstrap offers an awesome grid system for layouting web projects but also comes with a ton of other stuff you might not need or want such as normalise styles, components, and compilation via SCSS. Here's how to only include the grid system on its own using vanilla CSS.
Now to importing. The file we desire is located at the following path from the root of the Bootstrap package ("node_modules/bootstrap/"): "dist/css/bootstrap.grid.css". Assuming you're running a npm package-compatible bundler (such as Vite), you can insert the following line into your index stylesheet to easily import it:
@import 'bootstrap/dist/css/bootstrap-grid.css';