help with understanding open price

#1
Dear traders

I have joined newly to this group, and iam a new entrant into stock markets. I have been analyzing the stock market data and have a basic question about open price

I have observerd that the value of Open in most of the stock data webstes changes a couple of times in the morning.

ex: at 9:30am i observer a particular price listed as Open, and within 15-20 mins I observe that open price got changed.

Please pardon my ignorance and clear my doubt :)

PS: I also have a confusion between frist trade price and open price
 

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