Go modules were first introduced in Go version 1.11. At the time of writing, the latest Go version is 1.13. Although the general idea behind Go modules will remain the same, some of the presented details might change in future versions of Go.
A Go module is like a Go package with a version. Go uses semantic versioning for versioning modules. This means that versions begin with the letter v followed by the version number. Therefore, you can have versions such as v1.0.0, v1.0.5, and v2.0.2. The v1, v2, or v3 part signifies the major version of a Go package that is usually not backwards compatible. This means that if your Go program works with v1, it will not necessarily work with v2 or v3 – it might work, but you cannot count on it.
The second number in a version is about features. Usually v1.1.0 has more features than v1.0.2 or v1.0.0, while being compatible...