Nice Tutorial. Here is my go-to for Jekyll and TailwindCSS -- Jekyll Starter Tailwind[1] by Taylor Bryant.
But isn't this a bit outdated now? I think it still uses Tailwind CSS 2.
The idea is that Jekyll is Ruby while the way Tailwind is setup (usually) is easier managed by the available NPMs. This kit makes it easy to marry the two.
I like it as this is simpler than the others I had seen, nothing more than the bare needed to get the work done.