Spaces After Periods

[Unregistered]

I was taught there are two spaces after every period. Now I see one and sometimes three spaces after periods. Is there still a rule that applies?

thanks,

[2006]

I was taught there are two spaces after every period. Now I see one and sometimes three spaces after periods. Is there still a rule that applies?

thanks,

Having one space, not only after periods but also after other punctuations, is the longstanding practice. I would recommend that you do that too.

[Tdol]

There are various conventions; some use one after all punctuation, others one after commas, etc, and two to end a sentence.