Is there an expert on daytrading here? How do you even start

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Is there an expert on daytrading here?

How do you even start it? Where do you have to open an account? Do I go to the NASDAQ website and do it there? Or are there websites where you can trade on various other markets too? What about forex exchange? Where do you do that?

Also, I'm from Europe, can I trade with American company stocks or can I only trade with local companies (which are pretty much worthless anyway).

Also, how do I pay taxes? Do I even have to? Especially when I'm trading with American stocks in Europe? Will my government one day show up at my door and demand I pay them something?

I just really don't know how it works.

I had a demo account on eToro for a month a few years ago and I literally doubled my initial capital, so I want to do it with real money now. I could choose eToro of course but I heard they tend to fuck with you when you try to get your money out.

What are some safe and trustworthy websites?

I just realized I should post it on /biz/, but whatever. I'm a neet robot.