I am new to astronomy and astrophysics, can anyone point to a great free online place to learn scientific notation? I am quite obsessed with learning the math, but unfortunately have not the funds to attend a proper school. Unfortunately I work for a cheap employer who doesn't even pay for work performed, he thinks I am a machine who is there to do his bidding at no cost to him. Is there any place online where I can learn the meanings and pronunciations of the symbols. I already understand the Power of 10. I know that this one Ω is Omega, and this one ∞ is infinity, and this one Δ is delta, and this one ∅ equals the content of my wallet, and the small numbers and letters are exponents. But how and when to use them is perplexing. I need a class. any recommendations? Thanks.