How to download and setup go-ethereum
Open terminal and run command
git clone https://github.com/ethereum/go-ethereum.git
git clone is used to create a copy or clone of go-ethereum repositories.
You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with go-ethereum https://github.com/ethereum/go-ethereum/archive/master.zip
Or simply clone go-ethereum with SSH
[email protected]:ethereum/go-ethereum.git