We can use the DOM (Depth of Market) as a scalper. There is a wealth of information "hidden" in the DOM but a human watching the situation is powerless to interpret it, usually.
Many people think that large size on the Ask/Offer side of the DOM "blocks" the price from moving higher. Actually, the opposite is true. Price actually moves in the direction of more size quoted on the DOM.
Price moves to size or size is placed where price will be moved.
You wouldn't know that without intensive analysis in real time, because your eye can't usually pick out these things.
All you need is just watch the orderbook screen like its God. As when you literally watch the market trade, you will learn how to trade.