What api for live trading? transaction costs? how things work?

Hello, I'm new to this whole trading thing, and I've been looking for quite some time now to create a trading system. I have a few questions in mind but first, I want to understand the process, let's say I have a sum of money and I want to invest that money in stock market, and go from there, and I want the whole process to be controlled through an api and I'm not talking about backtesting here, I'm talking about the real thing. My questions are what api supports this? what are the transaction costs? what units am I buying / selling called? And how ohlc data translate into figures during the process of buying selling? I mean if AAPL's price is $112 and 2 hours later it became $112.1, and let's say i buy 1 stock or I don't know what to call it, and sell after 2 hours, how much have I earned? and for python / software devs like myself, what libraries do you recommend? and also for software devs, what is the recommended way / libraries that are useful / web frameworks I need to learn, to create a minimal system that is able to control the whole trading process within the same place? I'm asking these questions for if I'm going to simulate trades and do realistic backtesting, I need to understand the real process and make the simulation as close as possible to the real thing.

Submitted September 27, 2020 at 08:40AM by emadboctor
via https://ift.tt/3cAlDBM

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