I have done a couple of writing for the web courses and both of them have told me the same thing.
That you want to have lots of good white space on the right side of the screen. To do this they tell us that you should only justify the left hand margin and not the right. This is meant to make the page look nice for people to read. My problem is that I look at posts and pages like that and think how unprofessional. Nice neat justified margins on both sides of the text signifies to me that the editor has taken the time to tidy up the page. Below this post is one where I haven’t justified both sides, while this one is aligned fully. 🙂
Which do you prefer? Is it just me being overly tidy? I am trying to work out in my head whether I should just go with what the course writers say or work to what I like. 😆