You press to one side, unless, of course, the block seems to need open seams... Or!!!
We will all have variations of the answer, because we are all individuals. Sometimes we do as we are told, and sometimes we are happier doing it differently.
You have to decide what you are going to do, based on how you are going to quilt, the number of seams meeting, etc.
So do as you like. You will learn what works best for you. :wink: