ETF liquidity

Hello Sirs, I am new one here and I am looking for your help.

I have a list of several ETFs for which I would like to check liquidity and before start doing this I will appreciate your ideas and suggestions.

- I found out that ETFs liquidity is not determined by its trading volume, but the trading volume is more of an indicator of a funds popularity and how much it was traded in the past not how liquid it is.
-So there is a suggestion that better gauge of liquidity is to look at the number of shares and other assets being traded. (is this approach okay? Any other innovative measures could be taken? or any other ideas how to measure ETF liquidity?)

-For which information should I look/be careful for when I will investigating assets liquidity (just volume -buying and selling, or anything else?)

Many Thanks,

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