Nifty seems to be moving in an ascending triangle. The resistance at 15900 has been tested 4 times. There is an unfilled gap between 15738-15764. We can see a drop to this level with some sort of liquidity hunt before moving higher.
I see 15635 as an invalidation level.
P.S: This is NOT investment advice. This chart is meant for learning purposes only. Invest your capital at your own risk.