How to you use market depth to buy and sell shares?

Question

I need to know where to get these data from and how to use market depth to buy and sell shares.
Thanks.
       

Answer 1

It is sometimes very easy to identify support and resistance points using Market depth. Having access to the market depth for day trading is an advantage as you can read where the big players position themselves and where the big sellers are during the day.

The market depth is a constant moving grid of buyers and sellers orders in the market. Remember that there are two moving factors that move the market Demand and Supply. And like any other market demand and supply eventually dictates the final price.
       

Answer 2

In finance, market depth is the size of an order needed to move the market a given amount. If the market is deep, a large order is needed to change the price. Market depth closely relates to the notion of liquidity, the ease to find a trading partner for a given order: a deep market is also a liquid market.
       

Answer 3

Market depth lists all buy and sell orders in the market for a particular security. If you wish to see if there is sufficient liquidity to sell a particular security, you can quickly check how many orders exist, and at which prices. This is particularly important for certain interest rate securities and warrants, where liquidity can be low