Where do I go to learn about taxes for free (or nearly free)?

I’m not looking to become a tax accountant, not even eventually, but I do want to get good enough to prepare fairly complex individual (not corporate or estate) tax returns. I want to get past the beginner stage and do returns with Schedule K-1’s, lots of 1099’s of various kinds, rental income, and maybe even partnerships.

However, I do not want to spend a lot of money doing this, but I am willing to spend the time. Is this possible? Where can I turn to?