golang 包管理和go mod看下面两节课：
https://golang-tech-stack.com/tutorial/golang/golang-package
https://golang-tech-stack.com/tutorial/golang/go-module
golang项目包如何规划，看下面两个项目：
https://golang-tech-stack.com/tutorial/project1
https://golang-tech-stack.com/tutorial/project02