The depth ladder is a live list of who wants to buy and who wants to sell, and at what price. Bids rest below the inside, offers above it, and the number in the middle is the last trade. Learn to read the rungs and you see intent, not just a moving price.
The inside is the fight
The best bid and the best offer bracket the argument. A thin spread means both sides broadly agree; a wide one means the market is still being decided in real time.
Pulls tell you as much as adds
Size that appears is interest; size that vanishes the moment price approaches is a bluff called. Watching the rungs fill and empty is half of what a scalper does all session.
One click off the rung
An entry sits on the price you are watching, so a fill is a single motion, not a hunt through a menu.
From the rungs to your account
The desk opens once you are through the door. However you searched — a plain NinjaTrader login, or the two-word ninja trader — the same layout is waiting. Head to your sign-in and the rungs pick up where you left them.