This is an acceptable place to start off in learning about management. It gives you a definition of management, related articles, and a few video clips. And as it is a decent website, you will find other links as well. However, there are a few weaknesses as well.
First, it is not as robust as it could be. In other words, more articles would be better. Second, it is not academic. It would be better if professors in business schools wrote the articles. Third, it does not seem up to date. The world of business moves quickly.
In light of these weaknesses, I would suggest that you start with enotes and business schools websites. You will find a lot of information. In addition, read and listen to some articles and videos on bloomberg.com.