OpenInterest and VolumeTraded

How to use OpenInterest and VolumeTraded?
They are there for me to use but I have no idea how I can make use of them if there is no data to compare to previous day.

Please check the below link, it compares today’s change in OI and Volume to Yesterday’s quantity.

There are theories built around OI , price and Volume, which looks good in the books, but how much of it can be practically implemented for stock trading is still questionable.


Thanks Arjun for prompt response. I know this part.
My question as related to Sentinel trigger that has option of OI and Volumes but there is no example of how to use it.
Also, no one will investigate and come up with numbers related to OI and Volumes to set a trigger.
All in all, these two triggers have no use for trigger at present.