This is one of the most important things you can learn as a blogger. Content is by and large the most important thing when it comes to increasing traffic, generating more money or simply keeping your readers coming back.
Far too often bloggers put way too much attention into keywords, advertising, user interaction, social media and any of a number of ways to generate traffic. These are all effective and important strategies, but they all have one thing in common. If your content is awful, people are going to be leaving your site pretty quickly.