Nifty future charts are very useful to find out exact areas of support as well as resistance over the daily chart. As charts are representation of historical data, it becomes very useful to see how markets have reacted earlier to those levels and depending on that reaction, history may repeat itself. Now see a level where nifty future previously found support on that daily chart, then check which was the level that proved to be a resistance, this is as simple as that. Now you have support and resistance from the historical charts (EOD chart), next you may use the technical analysis tools such as trend lines, price channels and Fibonacci retracement to get more support resistance zone. Here I prefer to use Fibonacci retracement levels, I my trading career I have mainly used this tool and my success rate was about 75% in a long run.