Swap is when you hold a position of a specific product through the settlement time,your account may be charged/deposited into the product's corresponding overnight interest.
Each product will have two swap rates: one for short positions, another for long positions. Depending on the difference, your account will either be debited or credited a certain amount based on the swap rate.
Calculation Formula (Daily): trading lot * contract size * opening price * daily swap rate (%)
For each product's swap rates, please refer to the "Specification" on BitForex MT5.
A commission is a fee charged by a trader for buying or selling a product.
For Forex/Commodities/Metals/Indices: 10USD / per lot
For Cryptocurrencies: 0.08% per trade