Here are some terms and their interpretation:
Course (quote) currency pair  — this is how many units of currency, the second in the acronym, estimated per unit of currency, which is the first in the acronym. Example: The phrase «the euro compared with the U.S. dollar (EUR / USD) is equivalent to 1.2505» which means that 1 Euro 1.2505 U.S. dollar yield.

Storidzh (Storige) — fee for the transfer of the position overnight. Can be positive (ie, added to the trading account) or negative (debited from the account) value. It depends on the interest rate differential between countries whose currencies are involved in the transaction.

Bid (Bid)  — a rate at which you are able to implement the currency held in the first place in the abbreviation (in this example, the euro), and acquire a suitable the amount of currency to a second place in the abbreviation (in this example, the U.S. dollar).

Ask (ASA)  — a rate at which you can buy currency held by the first abbreviation (in this example, the euro), and implement the necessary amount of foreign currency , located on the second place in the abbreviation (in this example, the U.S. dollar).

Lot (lot) — fixed standard amount of currency allocated to operations in foreign currency exchange for a pledge — the margin. Sometimes also called the size of the contract. 1.0 Dimensions Lot for each currency pair is shown in the contract specifications.

Spread (spread)  — the difference between Ask and Bid.

Exchange rate — the price of the currency of one country expressed in the currency of another country. It can be set based on supply and demand in a free market, or to be strictly regulated the government's decision or its chief financial and credit authority (Central Bank).

Pips (pip)  — this is the minimum price change parameter.

Margin (margin) — the amount of security deposit, which is available under the dealing arm.