Nothing drives conversions away faster than confusion. Have you ever tried to create a password for an account but keep getting an error because it doesn’t meet the standards. Microcopy to the rescue. Check out this example from Bitly.
They use explanation text under the password field to explain all the components they require of a password. As you fill out the password, the components that are included become highlighted, letting you know right away that you are meeting the requirements.
Now that’s some helpful Microcopy!