Write so the reader doesn’t have to scroll, can read it and understand it a year later, and put the important stuff in the first line.
When writing a recipe or directions, don’t say “add the flour now.” Instead, reiterate how much flour is to be added so the reader doesn’t have to scroll back to the top and see how much is to be added. “Add 2 cups of flour now.”
When arranging a meeting, don’t say, “we can meet up next Saturday.” Say, “we can meet up next Saturday, April 10th.” Now the information is not hooked to that one single day in time and there is much less opportunity of somebody misinterpreting your message.
Finally, condense everything in a single line and put that first to save your reader’s time. Respect the user and the user will respect you.