A perfectly organized set of Google Docs or Word Docs. Except, they would track exactly who has seen what and when.
You’d be able to add videos anywhere that needs more explanation.
You could add tests to make sure that what you’re saying is perfectly understood.
And they would be grouped intuitively into every unique role in your business so no one has access to more than they need or feels overwhelmed with job responsibilities.
Google Docs and MS Word don’t do that. Trainual does.