Phil Badger guides us through the varieties of liberalism, historical and philosophical.
https://philosophynow.org/issues/82/What_is_Liberalism
What is Liberalism?
Re: What is Liberalism?
Phil Badger is well-read, and this article is very fair-minded, but I doubt he has checked out the radical philosopher Ayn Rand. She's an updated classical liberal. The future belongs to updated classical liberalism.