(Koa+MongoDB is a good combination. In this course, we will follow experienced engineers from large factories to carry out the whole process of enterprise-level and next-generation Web projects. The course uses Node.js as an introduction, teaches modular technology in Node, gradually and quickly transitions to the content of the Koa part, then uses scaffolding to build Koa applications, and then quickly advances to the NoSQL and MongoDB parts, and then enters the project. The core part is explained in detail through each individual stage, until the project builds a production environment, and finally deploys the project and releases it online. Finally, a course review and summary was also arranged.)