PornAOSP is a custom Android distribution based on LineageOS, focused on privacy while doing... emmmm... certain activities.

To get started with Android/LineageOS, you'll need to get familiar with Git and Repo.

To initialize your local repository using the LineageOS trees, use a command like this:

repo init -u git://github.com/PAOSP/android.git -b paosp-n

Then to sync up:

repo sync

Please see the LineageOS Wiki for building instructions