what is a good source for learning?
I just saw this this morning. It is a pretty nice list of "Free primary Jewish sources and resources on the Internet".
But a clarification of the question can help with what you are looking for. A site with discussions of Jewish learning topics? Primary sources?
I don't know your level so here is a list:
- http://www.hebrewbooks.org contains 49,000 books in English and Hebrew in OCR. (intermediate-advanced)
- http://www.haoros.com/ for in-depth Hebrew pilpulim (advanced).
- http://www.sichosinenglish.org Chassidus in English (beginners to intermediate)
- http://www.Chabad.org has a library with some classical sfarim, as well many articles. (beginners to intermediate)