One of the most powerful uses of content marketing is to build an engine that continually delivers organic search traffic. The best way to do that is to infuse SEO best practices into your content from the ground up. 

You can only improve what you can measure, though. And some SEO tools can be pricey, especially if you're just starting out. That's why I put together 30 of the best free SEO tools for content marketers. 

Why should content marketers care about SEO 

Strong content engines that perform well on SEO consistently drive organic traffic to your web properties. The more people get to your site, the better the chances are of buying something or doing something you want them to do. 

Content marketing that has SEO built in from the ground up gives you a campaign that can compound over time. Your blog post or article can deliver value to your audience and your company over the next few years. That's what really separates content marketing from most...