When developing, I try to think what it'll be like to return to the project in several months and how hard it would be for someone new to start contributing to

When developing, I try to think what it'll be like to return to the project in several months and how hard it would be for someone new to start contributing to the project. I try to document everything I think that will help and, even better, automate those steps with scripts. For example, deploying to staging or production should ideally be a single command so if the documentation for this grows too lengthy I'll take steps to automate it.