I believe on candlestick patterns because it is the price thing or stuff in the chart that gives us an idea how the market is going or what going on where it is heading. Just a simple things and i will add more. Candlestick is based ln psychology as it is not only a pattern. We have to applt and think of it will work and if it is not a possible trap that may occur. A combination of other indicators can be nore useful.