There are two ways wicks can help you in your analysis and trading.
First, they can give you an early warning of the possible trend change by showing momentum loss.
For example:
Suppose you see three or more long wicks below the candle body at the absolute bottom of your chart.
In that case, the selling momentum and trend are weak, and there's a high probability that the sentiment will change to bullish.
Suppose you see three or more long wicks above the candle body at the absolute top of your chart.
In that case, the buying momentum and trend is weak, and there's a high probability that the sentiment will change to bearish.