Describe Where the Link Goes
Whether you are using text or a graphic with text in it, care should be taken to provide clear link titles. Use the Firefox Developer tool and select Navigation > Links. This will list all the links on your page. If you were visiting your site for the first time and could only see this list of links, would you know where each one of them was going to take you? This doesn't necessarily mean more text, but sometimes a few carefully thoughtout words can describe something better than a sentence.

The solution for this is to write clearly titled links. For example, if your link name is "More..." a visitor has no idea of what they will be getting more of. If it reads: "More Information" would this help? Not really. However, "Art Exhibit, Learn More" is more explicit.

Same Text, Different Place
This is a common error on pages that display similar content, such as a news site that lists multiple stories, with a link that reads, "More" after each one. Again, when visitors pull up all the links as a quick way to find what they want, they will be confused if they run across two or more links with the same name that takes them to two different places. You will want to avoid this by giving each unique link a unique name.