The Linkedin Marketing Blog is the crème de la crème of the marketing blogs, with almost 60 topics. I used to go there to find good content to inspire me to write you some helpful content.
The hottest topic is the Best Practices: Content Marketing with over 300 posts. The one brought me to this place was this: Marketing Book Worth a Look.
Here you can read the list of them. And a clickable link to it's original place.
(Figures in front of the Titles are the number of posts in that Topic)