For a “[I]basic[/I] understanding”, very little time. A basic understanding isn’t complicated at all? Hours rather than days, anyway.
And then another three years after that before I was really making what most people would call a living from it. And I had a lot of initial (and continuing) advantages which many people don’t have.
For a small minority, I think. (Just like most forms of attempted self-employment?).
These figures are widely bandied about without sources being cited for them. Who knows what the truth is? (If I had to guess, I’d guess that it’s actually higher than 95%, to be honest, but just like everyone else I can’t prove it or even really adduce any evidence for it.)
There are certainly some of us here making our livings this way. (I actually switched from spot forex to futures a few months ago, so strictly speaking I’m no longer a forex trader, but I did eventually make a living from it for four years, and the switch to futures hasn’t really changed how I actually trade very much at all.)
From my perspective, it’s very regular, small wins interspersed by regular, very small losses. Successful trading is primarily about risk management, not profit maximisation. I now do about 100-150 trades per month, and my trades are open for anything between 5 minutes and 5 hours (with the [I]average[/I] much nearer the 5 minute end of the scale). There are many other ways, of course, but that’s what suits me. I’m not interested in “a few big wins”: I need my steady-ish monthly income.
Welcome to the forum. Asking more specific questions, whenever you’re ready to, may produce more helpful responses. Good luck!