You have to set the
GOPATH environment variable to something like
d:\myprojects\go. That's where your code and libraries will be stored.
Your code should be located in a folder like
Relevant section from the docs:
Test your installation
Check that Go is installed correctly by setting up a workspace and building a simple program, as follows.
Create a directory to contain your workspace, $HOME/work for example, and set the GOPATH environment variable to point to that location.
$ export GOPATH=$HOME/work You should put the above command in your shell startup script ($HOME/.profile for example) or, if you use Windows, follow the instructions above to set the GOPATH environment variable on your system.
Next, make the directories src/github.com/user/hello inside your workspace (if you use GitHub, substitute your user name for user), and inside the hello directory create a file named hello.go with the following contents:
See the Go docs for more details, especially on how to do it on windows: https://golang.org/doc/install