To get started with Android/OkcarOS, you'll need to get familiar with Source Control Tools.
To initialize your local repository using the OkcarOS trees, use a command like this:
repo init -u git@github.com:okcar-os/android.git -b okcar-1.0 --git-lfs
#or
repo init -u https://github.com/okcar-os/android.git -b okcar-1.0 --git-lfs
Then to sync up:
repo sync
Please see the OkcarOS Wiki for building instructions, by device.
Builds produced can be downloaded from OkcarOS downloads.