The volume of transactions in forex is expressed in lots. Where is 1 lot for a regular account at FxPro is worth 100,000 USD
You still remember about leverage or funds fulcrum? For example you have a capital of 500 USD, the leverage is 1:50, meaning you can trade up to 500 x 50 USD = 25,000 USD or about 0.4 lots (calculated from 25,000/100,000 USD).
The bigger the leverage, the more you can trade with increasing value. For example you have a capital of 500 USD, leverage 1:1000, meaning you can trade up to 500 x 1000 USD = 500,000 USD or about 5 lots (calculated from 500,000 / 100,000 USD).
The larger the lot used for trading, then you have the potential to benefit bigger. But also keep in mind that using leverage and lots The bigger it is, it means that if you lose, the more you lose big.
For beginners who have not traded with an account real, it is recommended to use small lots first formerly. After experience can be added volume gradually.