Some older folks I’ve encountered are furiously insistent about the eternal propriety of sentence-dividing double spaces. Likely they also advocate for the retention of the long s, and I wish them much ſucceſs. If you’re a younger person who’s only ever typed on a computer keyboard, odds are good you were not taught the double-space thing, so feel free to slide past this subject altogether with the head-shaking insouciance of your generation.