What documentation should be maintained for the Bitrix project?

Question

Project management

What kind of documentation should a developer keep if he alone is engaged in a project on Bitrix (online store)?
Hypothetically, you came to the project after him, what would you ideally like to be provided with? (well, except for access, of course)

Answer 1

You just need to maintain some kind of project management system, where there will be tasks, comments on them by the client and developers, and when the developer closes the task, he needs to attach a file with a brief report to it, what he did, in which files for what purpose and why exactly.
The code also needs to be commented, leaving at least information about who wrote it, on what date, for what task.

Answer 2

A well-designed and written project does not need documentation.

Answer 3

We used git + trello