Signals can be deceiving and can also make you lose your money. You should always be mindful of the market so that you are aware when to buy and sell.
Many traders are still not that knowledgeable about signal trading as it is not a 100% profit when you do it. Trading signals can also be fake and can cause you huge losses in the market.
People can learn those things so that they will avoid relying on those signals, but manual technical analysis is really much better among other strategies to know when to buy and sell assets. As long as you are working so hard to learn more in trading, you will see that technical analysis is the most effective thing to do before making strategies and plans in your future transactions.