Don't copy files anywhere, you'll pollute your system with random files in random locations, instead ensure your system is properly configured.

When you install Golang, you should perform two steps that unfortunately the installation does not take care of:

Set up GOPATH in your environment. On *nix it could be e.g. $HOME/go, on Windows e.g. C:\source\go.
Update your PATH to include $GOPATH/bin or %GOPATH%\bin. If your GOPATH is /home/user/go, include /home/user/go/bin to your PATH. If your GOPATH is /Users/user/go, include /Users/user/go to your PATH. If your GOPATH is C:\source\go include C:\source\go\bin in your PATH, and so on.
Restart the applications in question - IDE, Terminals, etc. to ensure the PATH and GOPATH are properly updated, as the environment gets configured at the time the application starts, not at the time you try to run a command.
Confirm the new environment is correct via go env and checking your PATH, e.g.

Linux, MacOS, etc.

echo $GOPATH
echo $PATH | grep $GOPATH

Windows

echo %GOPATH%
echo %PATH% | find "%GOPATH%"

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