You know that documentation is crucial in any software development, mainly because it increases the quality, decreases the number of meetings, and makes the team more scalable. The question is how to start a new repository or a non-documentation project. This project will clarify how to start documentation in a regular source code repository.
The documentation on the source repository applies as tactical documentation. There are also strategic ones that cover the architecture, such as the C4 model, tech radar, and architecture decision record (ADR), which we won't cover in this tutorial.