So I've been a fingernail minimalist for years - I paint my toenails but very rarely my fingernails. I usually just clipped them every week or two, since once they got to a much of a length they'd usually break off or get caught on something. But recently I started taking biotin supplements and it's making a big difference - suddenly I've got real nails that aren't just disintegrating when they grow past the ends of my fingers.

I've realized that I don't even own a nail file anymore - does anyone have any recommendations for files, maybe buffing, all that jazz? Pretend I'm a total newb about this sort of thing.