I am a self learning student of mathematics, that is I never had classroom experience beyond high school. I am seeking to self study this subject and often when I asked questions on MSE I find that I am lacking in the basic theories of calculus and algebra, and this gets my questions ignored (the solutions of which are not available on internet and I don't know where to begin with solving the questions I asked). So how do I become a productive member of the community? because I think I have a lot of learning gaps. Is there any resource from which I can practice and be confident enough to present proper mathematical proofs and also develop an expertise in solving the mathematical problems?