Yes there are free channels for potential signal however, thats not accurate and concrete type of trading signal. Im not sure why some prefer to have this if they can learn the fundamentals of trading and then execute it themselves. Yeah its not hard, but in signal youll definitely blame then if the trading didnt panned out. In every strategy theirs always a failure, so acceptance is a must to learn and gain experience on setting it up. Might be better than random signal giving false hope.
Trading is risky and difficult but if you are trading dependently by signals of any group (free or paid), you are not a good trader. By depending on other people for trading decisions, you will lose money if they are wrong, and you can not control accuracy of their signals. While as said it is not easy to trade accurately in a volatile and unpredictable market.
If you can not trade independently, why don't think of forget about trading and do something else like Long Term Investment?