An order book is an electronic list of orders to buy or sell a specific asset.

Quotation - the value of one unit of a financial asset.

Leverage is the use of borrowed funds that allow traders to open positions that exceed their deposit.

Liquidation is a process of forced closing of a position due to partial or complete loss of the trader's initial margin.

Long is a trading strategy of a trader, when he makes money from an increase in the price of an asset.

Margin - the share of your funds in the position.