The green Gann lines (coming from top left to bottom right) acted as resistance and now Nifty is near to last Green Gann line, whereas Purple Gann lines acted as support while nifty was recovering. Clearing LTH 25075 will clear all the Gann lines and then all the Gann lines will act as support, specially the purple Gann line at the top will keep nifty moving up as long as it remains above this Gann line.
On upper side Trendlines in sky blue will act as resistance above LTH.
The point where 2 Gann lines crossing each other is a strong point to act as support or resistance.
Yellow lines are time cycle lines when nifty will show trending moves. Look at the high and low formed considering 2 candles before and after the yellow line and from the low uptrend or high a down trend can be seen. As of now nifty is in uptrend so look for uptrend move rather to short it.