Prior to building the code, start by creating a source directory called workspace/, where we can clone the Bitcoin Core source repository:

mkdir workspace && cd

To download the Bitcoin Core source code, we'll use git to clone the latest version of its repository in the current local directory:

git clone https://github.com/bitcoin/bitcoin.git && cd bitcoin

The download process will take a few minutes. At the end, you'll get a new directory called bitcoin/ containing all the Bitcoin source code files.