Exactly how much did a bottle of anything cost in the 19th century? Who picked up the horse poop off the roads? How was anything kept cold? Did ice cream even exist? Whose job was it to light the street lamps? Did young women always wear hats when outside? If bathrooms didn't exist yet, what did the facilities of the time look like? Where did young women wash their long hair? What colours were popular in clothes, furnishings and decor like wallpaper. Was wallpaper popular back then? I'm sure you get my drift ... so many things to find out. And the thing is, everything I learned helped me to immerse myself into the lives of my characters.
For instance, who would want to read about modern technology in a pre-computer era? Okay, well there's Back To The Future, when "Doc" Brown arrives from the future in his DeLorean with all its gadgets. But still...
Yeah, um. Nope.
At least, that's how I see it so far, and I'm learning more and more every day.
And now you know.