I originally copied, renamed, and edited one of the themes that came with WordPress and when it reverted to the one called “classic” a few times, I figured why change the actual “classic” theme so that it has nothing to switch to. That was when I learned that the actual “classic” theme was resetting to it’s original code after I had edited it. Sometimes my custom theme would survive an update, and the next time it reverted would not correspond with an update. I just don’t understand.