Volume is one of the few indicators I focus on. I'm primarily interested in looking for volume extremes. For example, when you see extremely high volume coinciding with a wick through major S/R, you should be mindful of a possible incoming reversal.

I really like looking at dollar volume, rather than standard (BTC denominated) volume. It's easier to recognize volume extremes.

I also absolutely love the volume profile tool (requires a Pro account on Tradingview). Gaps in the volume profile are often magnets for price, the same way price gaps in stock and commodity markets are.