The explanation isn't complicated, but at first, it may seem a little strange and requires a two-part explanation. First, remember that if it's midnight in New York when the New York forex market is closed, it's also the middle of the trading day somewhere -- in Tokyo, for instance. Also, keep in mind that forex is a worldwide market that is entirely virtual. There's no trading pit anywhere. When you enter a midnight forex trade on your laptop in New York, the trade is executed in Tokyo or in another of the several trading centers worldwide that are open when you initiate the trade.
On 1 January 1981, as part of changes beginning during 1978, the People's Bank of China allowed certain domestic "enterprises" to participate in foreign exchange trading.[51][52] Sometime during 1981, the South Korean government ended Forex controls and allowed free trade to occur for the first time. During 1988, the country's government accepted the IMF quota for international trade.[53]
The spread for EUR/GBP rises to 0.8532-0.8533 and you decide to sell your euros back into pounds at the bid price of 0.8532. The €10,000 you previously bought is now therefore sold for £8532. Your profit on this transaction is £8532 minus the original cost of buying the euros (£8415) which is £117. Note that your profit is always determined in the second currency of the forex pair.
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The series of contagious currency crises in the 1990s—in Mexico, Brazil, East Asia, and Argentina—again focused policy makers’ minds on the problems of the international monetary system. Moves, albeit limited, were made toward a new international financial architecture. Most importantly, these crises led to the establishment of the Financial Stability Forum (since 2009 the Financial Stability Board), which investigated the problems of offshore, capital flows, and hedge funds; and the G20, which attempted to broaden the international regime’s membership and thus deepen its legitimacy. In addition, there were calls for a currency transaction tax, named after Nobel Laureate James Tobin’s proposal, from many civil society nongovernmental organizations as well as some governments. The success of international monetary reform is a crucial issue for governments and their autonomy, firms and the stability of their investments, and citizens who ultimately are those who absorb these effects as they are transmitted into everyday life.
The Forex pairs are divided into three main groups – majors, minors and exotic pairs. The main difference between the pairs is their liquidity which is a result of the trading volume of these pair. E.g., the major currency pairs are the most traded pairs and each include the USD and another currency, while the most traded minor pairs include one of the three major non-USD currencies (The Euro, the UK Pound and the Japanese Yen).
Old news (it was released a few hours ago), but for good order, the NY Fed GDP Nowcast estimate for Q1 comes in at 1.40% for the 1st quarter. That is unchanged from last week.  Below are the contributors and non-contributors given the releases this week. By the way, the Atlanta Fed estimate moved up to 2.3% on April 8th (from 2.1%).  Their next estimate will not be until Wednesday April 17.
Risk Disclosure: Trading in financial instruments and/or cryptocurrencies involves high risks including the risk of losing some, or all, of your investment amount, and may not be suitable for all investors. Prices of cryptocurrencies are extremely volatile and may be affected by external factors such as financial, regulatory or political events. Trading on margin increases the financial risks.
From Monday morning in Asia to Friday afternoon in New York, the forex market is a 24-hour market, meaning it does not close overnight. This differs from markets such as equities, bonds, and commodities, which all close for a period of time, generally in the New York late afternoon. However, as with most things there are exceptions. Some emerging market currencies closing for a period of time during the trading day. 
In the context of a general trading strategy, it is best to trade with trends. If the general trend of the FX market is moving up, you should be cautious and attentive in regards to taking any positions that may rely on the trend moving in the completely opposite direction. A trend can also apply to interest rates, equities, and different yields - and any other market that can be characterised by a movement in volume or price.
International parity conditions: Relative purchasing power parity, interest rate parity, Domestic Fisher effect, International Fisher effect. Though to some extent the above theories provide logical explanation for the fluctuations in exchange rates, yet these theories falter as they are based on challengeable assumptions [e.g., free flow of goods, services and capital] which seldom hold true in the real world.
When you trade forex, you're effectively borrowing the first currency in the pair to buy or sell the second currency. With a US$5-trillion-a-day market, the liquidity is so deep that liquidity providers—the big banks, basically—allow you to trade with leverage. To trade with leverage, you simply set aside the required margin for your trade size. If you're trading 200:1 leverage, for example, you can trade £2,000 in the market while only setting aside £10 in margin in your trading account. For 50:1 leverage, the same trade size would still only require about £40 in margin. This gives you much more exposure, while keeping your capital investment down.