How to document a large project, for example on a framework?

Question

PHP

Let's say a fairly large project is being made on the framework. It is necessary to document it so that in the future you will not forget where, how and what was done. What is the best way to do this? Write in a notepad, or are there any more tricky options?

Answer 1

phpDocumentor was invented for this a long time ago.

Answer 2

Write in the IDE, next to the code, in markdown format.