A few years ago I was cured of my two-spaces-after-a-full-stop habit. My client told me her rule was one space only, and since I’m a firm believer in putting dinner on the table, I immediately made the switch.
Since then I’ve argued with others who stick to the two-space habit. Well, I need argue no longer. This article settles it once and for all. No, no: don’t thank me – https://www.sporcle.com/blog/2017/05/how-many-spaces-go-at-the-end-of-a-sentence/