Ideally you would have a project that you use and maintain/update over a long period. It doesn't need to be perfect, it doesn't need to consume all your free t

Ideally you would have a project that you use and maintain/update over a long period. It doesn't need to be perfect, it doesn't need to consume all your free time. You don't even need to write tests ;) But there's value in having to fix and refactor your old code: what abstraction proved useful or unnecessary, what code is easy or hard to change etc