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I used www.codecademy.com for awhile, and it was really helpful. Also Team Treehouse is great, but it has a monthly fee. w3 schools is also surprisingly useful, and youtube videos, if you need to see it in action!
codecademy(can see it on Youtube too), w3 schools, thenewbostonon**'s channel on Youtube), barelyfitz.com/screencast/html-training/css/positioning/, tizag.com