Are you new to forex? If so, you should open a demo account and start familiarizing yourself with how things work. Here’s how:

Greenwich Mean Time (GMT) is a term originally referring to mean solar time at the Royal Observatory in Greenwich, London. It is commonly used in practice to refer to Coordinated Universal Time (UTC).
 

What does this mean in the forex market?
GMT provides a standard of time for the world when trading the forex market. GMT [...]

New York and London: 8:00 am – 12:00 noon EST
Sydney and Tokyo: 7:00 pm – 2:00 am EST
London and Tokyo: 3:00 am – 4:00am EST
 
Trading when market sessions overlap provides higher volume and volatility.
 
For example, trading EUR/USD, GBP/USD currency pairs would give good results between 8:00 am and 12:00 noon EST when two markets for [...]

Forex or FX is short for the Foreign Exchange Currency Market – an over the counter (decentralized) market where all world currencies are traded.

Unique Features Of Forex
The forex market is the largest, most liquid market in the world with an average traded volume that exceeds $3.9 trillion per day and is open 24 hours a day except on weekends. Unlike other markets, the forex market allows for the use of high leverage. Because of these factors, the forex market is considered to be the market that is closest to being perfectly competitive.