Hows the best and safest way to learn wicca without a teacher?

I have a basic understanding. First and foremost being is that it is not a game.
Serious answers would be appreciated.
Thank you guys. Ill look into Scott Cunningham.

Get yourself a copy of Scott Cunningham's "Wicca: Guide for the Solitary Practitioner". It's the best Wicca / witch 101 lesson out there.

Beware: Stay away from other authors until you have an idea of what you're doing - most of the rest just try to convince you you need to buy a thousand dollars worth of their crap. Bull - this is a nature-based religion - nature provides everything you'd truly need.

(Not saying pretty things aren't nice - just saying don't feel like you "need" to spend money on something that nature can give you for free.)

You know know threes nothing wrong with going down to your local library and getting out a good book about the subject. Or look around for on line resources.

http://wicca.timerift.net is a good first stop, and the book suggestions there are decent.

Find Wiccans you respect, and ask them for advice, not in an annoying "teach me now!" way, but in a "hey, is there a book or website you recommend" way.

Also, use a little bit of your own powers of discernment...you'd be amazed how many questions we get from kids who read a fiction book or two and go OMG! I want to do that! If the book is fictional, don't use it as source material, and if it is non-fiction, don't assume the author isn't glossing over something or in some cases making things up...if it sounds too good to be true, it probably is.

I'll presume you are talking about eclectic Wicca rather than trad. If so, as stated above, Scott Cunningham was probably one of the better authors.

A good deal of eclectic Wicca beliefs and practices are almost identical with those of folk Chartism, so you may wish to look up that as well.

Scott Cunningham is definitely your best bet. However, if you are looking for something structured, I would recommend witch school.com (which will take you to their social site, but if you click on "my classes" it will take you to their classes).

Witchschool is a "church" of Wicca called Correllian. There are many different attitudes by pagans/vicunas to this tradition. However, if you use their classes as a resource and don't jump in without doing your own research first, you'll be fine. They offer many different free courses, of which I would recommend their First Degree (which is 13 lessons and takes 12 months to complete). They'll offer you a social site as well as a mentor if you want one.

http://www.classes.witchschool.com/course.asp (list of courses)

good luck!

Read a lot of books, listen to pod casts, participate in on line forums, get together for open circles with local groups, do all of these things and you're bound to stumble into information that rings true. Exposure to multitudes of experiences and opinions will help you figure out which are the most popular ideas and which make the most sense.
I'm sure you've already seen recommendations for Scott Cunninghams Wicca for the Solitary Practitioner... one of the most popular and recommended books out there for solitaries.
-Scarlet

Reading. Lots and lots of reading.