The market is changing continuously. So, you have to adjust your trading strategy according to that. Otherwise your profitable strategy will become a dessert.
I also think that. There is no holy grail in trading. So, instead, focus on learning about the market rather than looking for some magical indicator or strategy.
Controlling emotions is possible in trading. However, fully stop feeling emotion in trading is hard to achieve. It is better to feel less at making trading decision.
I agree with you. 100$ is enough to trade and make healthy profit out of it. If anyone invest more its up to them. However, I recommend to invest what you can afford to lose.
FX or forex is undoubtedly the biggest investment market in the world. People around the world come to the market because it is an easily accessible market. However, it is more risker than any other market.
There is leverage facility which make the trading easier for small trader. So, it does not matter if you have small capital, you can still make big profit with leverage.