What is the minimum capital needed for forex, options and futures trading ? Free and recommended simulators ?

06294086 asked: Hello guys,
I’m interested in learning more about forex, options and futures trading. I heard that there are mini or micro account that can go as little as US$ 200 or 300 dollar. Is it true ?
Also, any recommendations for free forex, options and futures trading simulators ? I know that some websites provide [...]