Check readability!

It should be obvious. But readability is a major concern in information design. And we often fail at this because we have not considered the context or the format or we fail because we value aesthetics over function. Perhaps the font size is not big enough or the contrast is too vague. So make sure that the text is not just readable but also pleasant to read in any given context. Whether it is on a mobile phone or in a social media feed and remember to test it.