To get started with Android/LineageOS, you'll need to get familiar with Source Control Tools.
To initialize your local repository using the LineageOS trees, use a command like this:
repo init -u https://github.com/LineageOSPlusPlus/manifests.git -b lospp-19.1
Then to sync up:
repo sync
and use our script
./build.sh