Best Practices for flake-parts

What are the best practices for reorganizing flake.nix to build a more modular nixos configuration using flake-parts? I see that home-manger already supports flake-parts https://nix-community.github.io/home-manager/index.xhtml#sec-flakes-flake-parts-module So now everything(nixosConfigurations, darwinConfigurations, homeManagerConfigurations) can be split up and organized into flake-parts modules.