i know that many people were taught to put two spaces between sentences. i was too. but these days, using two spaces is anobsolete habit. some say the habit originated in the typewriter era. others believe it began earlier. but guess what? it doesn’t matter. because either way, it’s not part of today’stypographic practice. if you have to use a typewriter-style font, you can use two spaces after sentences. (these are also known asmonospaced fonts.) otherwise, don’t.