I am teaching myself mathematics using textbooks and I'm currently studying the UK a-level syllabus (I think in the USA this is equivalent to pre-college algebra & calculus). Two resources I have found invaluable for this are this website (http://math.stackexchange.com) and Wolfram Alpha (http://wolframalpha.com). I am very grateful that with those tools, I have managed to understand any questions/doubts I have had so far.
Can anyone recommended other valuable resources for the self-taught student of mathematics at this basic level?
I hope questions of this format are valid here?