What are the most powerful figures that move Forex market?

Interest rate
Traditionally, if a country raises its interest rates, its currency will strengthen because investors will shift their assets to that country to gain higher returns.

Employment situation
Decreases in the payroll employment are considered as signs of a weak economic activity that could eventually lead to lower interest rates, which has negative impact on the currency.

Trade balance, budget and treasury budget
A country that has a significant Trade Balance deficit will generally have a weak currency as there will be continuous commercial sellings of its currency.

Gross Domestic Product (GDP)
GDP is reported quarterly and is followed very closely as it is a primary indicator of the strength of economic activity.
A high GDP figure is usually followed by expectations of higher interest rates, which is mostly positive for the currency.