Although I'm not yet ready for jhana meditation, I would like to read up on them to get a better understanding of what they are. I know about some books out there by Ajahn Brahm, Ayya Khema, and others. But I can't spend any money right now. Are there any online resources explaining the jhanas and how to attain them? And not something shallow or basic. I want something in-depth. That might be a stretch for the net, I understand, but it's worth a try.
Any feedback is appreciated.