From now on, you’re not allowed to put two spaces after a sentence. Only use one. I know two is what you were taught, but it puts too much space in between thoughts.
One space helps your writing flow better because the reader doesn’t get distracted by the unnecessary white space.
A lot of people are stuck on this convention. (ha) For instance, my wife gets on my case about this all the time; she insists on my use of two spaces, like a regular prescriptivist.