Noise on your chart refers to those candles that do not hold enough information to matter. For example if you are trading on a one-minute time frame how much useful information can a one-minute candle give you? When you trade on a noisy chart, the tendency for losses is higher because you will see what looks like a buy candlestick pattern only for price to start falling after you enter the trade. But noise exists on all timeframes, just that it is more prevalent on smaller timeframes.