The core Node.js libraries that you use to develop web applications change often, and it may be challenging to keep up and implement those improvements. In this course, Moving Forward with Mongoose.js, you'll learn about breaking changes when upgrading from Mongoose version 3 to version 4. First, you'll dive into a whirlwind review of an introduction to Mongoose for Node.js and MongoDB course. Next, you'll build upon that review and you'll learn about updates and improvements in Mongoose version 4. Finally, you'll discover the latest features that Mongoose version 4 has to offer. When you’re finished with this course, you'll have a better understanding of how to move forward in Mongoose version 4, where to find additional information on all breaking changes, and have the knowledge to confidently utilize the new features, improvements, and more advanced topics.