How does Open Interest (OI) help traders identify support and resistance levels through Option Chain Analysis?
Option chain is like market’s attendance sheet da Price chart tells you what already happened. Option chain gives a clue about where big players are placing their bets. Looking at OI buildup, unwinding, support and resistance strikes helps understand where the market may face trouble or find support pa.
But one mistake many beginners make is treating option chain like magic. Option chain alone is not enough. Combine it with price action, volume and market structure.
Panduranga bai is right 
. I’ll just add a few points based on my analaysis. For me, Option chain is like seeing where the market participants are standing right now. Price chart tells us what already happened, but Option chain gives some clues about where the market may face Resistance or find Support. One thing I usually look at is where Call oi and Put oi are building up. Higher Call oi can act as Resistance and higher Put oi can act as Support. Also, changes in oi sometimes help us understand whether fresh positions are getting added or existing positions are getting unwinded. That said, I feel many begginers make the mistake of looking at Option chain alone. It gives clues, but it’s not a crystal ball 
. Combining it with Price Action, Volume and overall Market Structure gives a much better Picture.
At the end of the day, Option chain is another tool in the toolbox, not a guarentee of what the market will do next.