Agree. But start with modules immediately. SOLID applies to modules as well as classes. [And if we're talking about Rust, then substitute "crate" wherever I wri

Agree. But start with modules immediately. SOLID applies to modules as well as classes. [And if we're talking about Rust, then substitute "crate" wherever I write "module"]. Basically be constantly refactoring your code into classes (or equiv.) and the classes into modules. It's super easy to join multiple modules into a single application: the linker, JVM, whatever does it automatically. It's insanely hard to break a monolithic application into modules.