WordPress multi-site is a powerful tool which lets you run thousands of websites with just one WordPress installation. Developing for WordPress multi-site, however, is a fine art which few have mastered. But it doesn’t have to be hard – it’s all about understanding the difference in behavior between a single site WP install and Multi-site and knowing which WordPress functions to use, when, and how. Join in and beat the competition — by making your plugins compatible with WordPress Multi-site!