A trading signal is simply a suggestion or advice to enter a trade (buy or sell), often generated by either technical or fundamental analyses. Any analysis can generate trading signals, but the most efficient signals come from a combination of technical and fundamental analyses.
But you need to treat the signal as a piece of information that will guide you in making an informed decision. This is because the end game for all crypto traders is to make a profit from either buying or selling crypto.
Traders use crypto trading signals to actively invest so that they can beat the market and make profitable moves. You can either adopt spot trading or futures trading. The former is done daily or regularly to make daily profits while the latter is relatively long-term.