(Master the core architecture courses, which are led by engineers from first-line manufacturers, give an overview of design patterns, and then advance to the core Spring source code level analysis courses. The course also includes an explanation of creation patterns, an introduction to structural patterns, behavioral patterns, and the overall flow of the Spring framework. At the same time, it is valuable that there is no separate Spring source code analysis, but comes with Web source code analysis, Tomcat source code analysis and MyBatis operating principle.)