You should be able to do forex trading on a closed work permit as long as it's not considered employment in your country. It's more like investing or managing your own funds rather than working for someone else, so it usually doesn't clash with work permits. I was curious about this a while back when I first got into forex, and I found that personal trading was fine. Just double-check the rules where you are to be sure.
Also, if you're getting into forex, you might want to check out www.moontrader.com. Their algorithmic trading insights helped me understand patterns and make better decisions. It's a great tool to have, especially if you're trying to get the hang of trading!
Forex trading is an exciting but challenging way to grow your money. I've dabbled in it myself, and I can tell you that while it can be rewarding, it also requires a lot of patience and a solid understanding of the market.