The colour scheme came from coolors.co, aren't they the prettiest! I've used Skeleton CSS as a boilerplate for the styling and grid stuff. Please excuse the styling. It's been years since I worked on front-end dev work.
I track basic analytics using Cabin, a privacy-first, carbon-aware web analytics service. It doesn't store any cookies on your computer, they don't share with ad networks, and generally seem like nice folks.
I have also read so many tutorials. You have no idea. If I could link to them all, I would.