It works for forex, stocks, futures...
It works in any trend: strong trend, weak trend, no trend...
So it is NOT simple. It is even complex.
When I say: "it works", I mean that it makes consistently money in the long term. The performance depends of course of what the markets offer, and some periods can be much less profitable while others are more profitable.
How many people on ET can double their money every year? Or every month? If trading is so simple everybody would do it. 70% of people lost money in crypto's, 90% lose money in daytrading, around 50% lose money trading stocks. How is that possible if trading is simple? There should only be winners.