For example, let's say I believe BTC will go down. So I BUY BTC. And then I wait for it to go down and then SELL.
Don't I lose money?
You'll lose the money if buy during the corrections but if you will wait for the bottom then that's a possible profit.
I don't know why many wants to join any signal group instead of learning the market on their own, are you thinking about an easy money here?
Ask for the timing as well because that's a different suggestion, if they can't provide this learn on your own, I'm telling you this is more worth it.