1. Directory structure. A thousand files within one folder? Bad (no matter how good the code is). Folder X (very low level stuff like operating with bits and bytes) at the same tree level than folder Y (critical business logic in terms of high level domain objects)? Bad.

2. Readme file. Buildme file. Can I understand what the repo is about just by reading the readme file? Good. Can I run the repo locally just by following the Buildme file? Good

3. Data examples alongside code