I'm planning on learning Oracle 11g. I do have some SQL experience. I know Oracle provides non-production version of their product, so i can get started with that. I think the free edition is the express edition, but just want to confirm.

Few questions:
1. Which 11g edition is for non-production use (free version)?
2. Any good authors recommanded or books for starter?

I'm planning on learning oracle database this month, since its probably the only chance i'll get in upcoming months. Any other information for starter would be helpful.