My spell checker shows that both "time zone" and "timezone" are correctly spelled. Which one of these is the correct one to use?
Should there be a space before a percent sign or not? Should you write 20% or 20 %? I'm not sure if there is any consensus about this or not. Is one way more common than the other?
In the past — or at least, when I was in elementary school — periods/full stops were followed by two spaces. Lately, it's become more and more common to see just one space. In the modern ...
I usually put a space before, and after / when indicating alternatives, such as in the following sentence. We review a module / theme per user. Is it correct, or should I re-write the sentence ...