If by trading, you mean high-frequency, then don't. I encourage you to instead study investing. But if you must learn trading (don't), then Ernie Chan and Michael Halls-Moore's book (s) might be a good place to start.
I think because it is hard to beat the HFT systems that are already co-located at exchanges. Second, it takes at a minimum $25,000 and probably $50,000 realistically to even get started trading. Most places wont let you jump in the ring without it. Third, the OP should be prepared to lose all their money and be ok with that.