The historical method focuses on the origin and evolution of the subject of study, and is specified in a chronology of times and milestones.
Knowledge is something cultural and historical, which is linked to the space and time in which we find ourselves. We integrate to our knowledge the things that are accessible to us, and this changes over time.
It is important that everything is documented. The big problem, for knowledge, is that there is no data. This often happens, for example, when studying the Paleolithic, Neolithic, or ancient civilizations. Another example is the fact that there is no canonical recipe for Spanish omelette.
It is important to know the history beyond the subject of study. Having a general culture and knowing the history of humanity, at a minimum level, is important to understand anything, since things are always in relation to their context.
A historical map, with a chronology of the times and the milestones that have caused a paradigm shift.