If you don't know the differences between versions 3 or 4 yet... My recommendation would be to start with bootstrap 4. You'll learn the downsides by the requirements of your project... maybe this is the hard way but that's the way to learn... Facing problems...

I use https://github.com/owais/django-webpack-loader together with https://www.npmjs.com/package/webpack-bundle-tracker to handle (hashed) file loading from webpack

+1, it's the best way to roll.