Yes, the Wizard of Odds site is probably one of the best ones. Another good one for beginners is
http://www.blackjackinfo.com/. Enter the particular number of decks, rules, etc. and it generates a strategy chart.
As you get more advanced into it and maybe into card counting, Stanford Wong's
www.bj21.com site is good. Also Frank Schoblete's
www.bjinsider.com - especially great info on Atlantic City blackjack each month.
You can also post any questions right here on EOG and the experts will be glad to assist.