A hammer is a very significant candle, I see it as an entry signal depending on the trend of the pair in question (only for uptrend though), if on the daily chart the trend is up, I always fancy entering a trade after a hammer on the daily, my stop will usually go underneath the hammer. I understand every trader is different and I'm happy to read anyone's view on this.
In my opinion, hammer pattern greatly helps traders to determine the entry point. I always try to find whether bearish or bullish hammers in order to understand is it right time to enter the position or not. Of course, the vast majority of traders prefers to check the trends and support/level resistance, however I combine everything and I handle the task of finding a proper entry point. Moreover, sometimes you can determine the exit point due to hammers So, I guess that it's a very universal pattern which should be learnt by novices.