* Using too many different fonts. A general rule of thumb is to use no more than two different fonts in a single design. Using too many fonts can make a design look cluttered and disorganized.
* Using fonts that are too similar. Fonts that are too similar can be difficult to distinguish from each other, which can make it difficult to read text.
* Using fonts that are too large or too small. Fonts that are too large can be overwhelming and difficult to read, while fonts that are too small can be difficult to see.
* Using fonts that are not appropriate for the content. Some fonts are more appropriate for certain types of content than others. For example, a serif font is typically a good choice for body text, while a sans-serif font is typically a good choice for headlines.
* Using poor contrast between text and background. Text should be easy to see against the background. If the contrast is too low, the text will be difficult to read.
* Using improper line spacing. Line spacing that is too tight or too loose can make text difficult to read.
* Using improper character spacing. Character spacing that is too tight or too loose can make text difficult to read.