Make sure link text is meaningful when taken out of context.
Don’t use web cliche`s such as “click here” or “more” when linking text. These hamper accessibility and don’t give the user a sense of where the link will lead. Instead, use descriptive links by embedding the link in text that describes its destination. (e.g. “read more about best practices for links“).
If your link leads to another site, set the link to open in a new tab.
Links to pages within the the same site should open in the current tab.
Avoid long lists of external links.
These will be difficult to maintain unless you plan on checking them regularly to ensure all links remain active. If you must include a list of links, make sure to include descriptions of each destination so users know where they are going.