Pine64 is actually a phone vendor which makes sort of open hardware.
LineageOS/ Omni / BlissOS / AEX are custom android ROMs (or custom Android distros). Yes you can create your own ROM after forking.
You can check XDA to see ROMs for various devices.
Pine64 is Android distro or is it independent of Android, is it pure Linux distro? Also can it be customized? Like can we have our own distro?
Pine64 is actually a phone vendor which makes sort of open hardware.
LineageOS/ Omni / BlissOS / AEX are custom android ROMs (or custom Android distros). Yes you can create your own ROM after forking.
You can check XDA to see ROMs for various devices.
Oh, so in order to run OS on Pine64, OS has to be Android fork or it can be linux fork?
Ummm. PinePhone is pretty open. You can run Android and Linux on it. IIRC, it coms with Manjaro-ARM preinstalled.