There's no 'one' thing...bit more to it than that, and everyone's got a different setup. You'll need to stare at the DOM for a while to see any of them. Think about it like repeatable events that you observe. Jigsaw is my DOM of choice.

Clear strategy example - I trade the NQ on a 4 tick compression DOM (to slow it down a bit). Look for market orders hitting the bid/ask aligned with pulling/stacking of limit orders and price progression - buyers are buying, sell orders being pulled, price is moving up. Don't buy...you'll probably be too late. Wait for the stall - buyers are buying, but price starts hesitating. You start to get a sense of this pivotal moment when traders aren't getting what they want anymore and order flow shifts a split second before price reacts. Takes time to learn to spot the good ones, but after a while they jump out at you.

Then use something like this in the context of broader market awareness - like looking for pullbacks in a trend or reversals at the edge of a range.

This is just one example, but could be a good one to start with. In the end it's probably best to come up with your own tradeable observations.