That’s what nix.dev is supposed to be. We‘re not terribly far with writing the actual tutorials yet, but here’s the curriculum so far: Tutorials overview · Issue #572 · NixOS/nix.dev · GitHub
Feel free to hook into that, help is greatly appreciated! The most sought-after topics according to Google Search Console are building container (Docker) images and setting up language-specific development environments. What seems not to be on most people‘s radar, I suppose because it’s so underexposed, are declarative user environments and in particular editor (vim, VScode) configuration.