Starting in FOREX trading

To start trading on FOREX, one must first learn how to read FOREX quotes. Foreign exchange quotes are always listed in pairs (e.g. USD/JPY 109.2): the first listed currency is known as the base currency with a constant value of 1 unit; while the currency listed in the second is known as counter. In our given example, USD/JPY 109.2 means a dollar of United States Dollar is equal to 109.2 Japanese Yen. In other words, the quote shows the relative value of one currency compare to the other. It means the value USD had been increased when USD/JPY quote goes up
However, a two-sided quote (e.g. EUR/USD 1.2435/1.2440) consisting of a 'bid' and ‘ask’ is often seen. The ‘bid’ price is the price at which you can sell the base currency; while the ‘ask’ price is where you can buy the base currency. The different of ‘bid & ask’ price is commonly known as ‘spread’. In the example of EUR/USD 1.2435/1.2440, this means you can buy 1 Euro Dollar with 1.2440 USD or sell 1 Euro 1.2435. Currency brokers make their profit through these differences of ‘bid & ask’ price and this is how they manage to provide their services to individual investors without charging them commission fees.
If you are new to trading it makes sense to deal in the more popular currencies. There are two main reasons for this. Firstly you do not want to be left with a currency where there is little interest and you may have difficulty selling. Secondly the spread between the bid/ask prices is likely to be narrower, making it easier to make a profit.