I've been teaching myself options trading. I doubt any of this will be better than "Options, Futures, and Other Derivatives" by John Hull (i'm eeking my way through that right now) but a guy on reddit wrote a free book, i downloaded it (look for a file called developingOptionsIntuition.pdf) he linked to a good set of comments on reddit explaining options from the beginning http://www.reddit.com/r/investing/comments/pigr5/optionstrading_102_past_the_basics/ here is the original link http://www.reddit.com/r/investing/comments/239ncq/i_wrote_a_draft_of_an_intermediateadvanced_book/ and a complete list of the comments that explain options

http://www.reddit.com/r/investing/comments/pigr5/optionstrading_102_past_the_basics/ http://www.reddit.com/r/investing/comments/pnray/optionstrading_103_the_premium/ http://www.reddit.com/r/investing/comments/psxp0/optionstrading_104_mechanics_of_buying_options/ http://www.reddit.com/r/investing/comments/q067b/optionstrading_105_risk_and_strategy_part_i/ http://www.reddit.com/r/investing/comments/qsazd/optionstrading_106_risk_and_strategy_part_iia/ http://www.reddit.com/r/investing/comments/qsbh8/optionstrading_107_risk_and_strategy_part_iib/