I categorize <a> into two: Links and Actions.

Links will take you to another location, mostly for information while Actions could also do the same but with a more targeted purpose.

Examples

Links

• See my latest case studies
• Post by Author Name

Actions

• Add New Category
• Edit Post
• Navigation Items
  • Home
  • Contact
  • Settings

Links can be left alone in CSS – because they are buried in paragraphs or sitting beside other texts. Actions require styles that will enhance their usability – like padding to increase its active area (easier to click).