Our modern lives are ruled by the geography of our area. Rivers, mountains, lakes, and ponds impede travel, forcing a road to go around them.
Unfortunately, maps have fallen out of favor thanks to satellite technology and the GPS in our cell phones. Many people don’t know how to read a map.
However, maps (and the ability to understand them) are a useful tool for authors of fantasy and speculative fiction, or indeed, any fiction set in any place and time.
Where I live, Puget Sound‘s shoreline determines the interstate highway’s path and the locations of cities and towns. Those detours add to the distance we must travel and increase the time it takes to go from one place to another.
The stylesheet is one of the most valuable tools an author can have to aid them in worldbuilding. It costs nothing to create but is a warehouse of information about your work-in-progress.
I suggest you include a glossary of created words, names, a list of sites where you got your research, and myriad notes related to that novel. Those are bits of knowledge you will be glad you made a note of, as they will contribute to the believability of your narrative.