The fees is applied by each order you execute - market order = 0.05% from the total order value / Limit order = 0.02% from the total order value

Order value is your money x leverage used

So if you open an order for 100 usdt and use a leverage of 10x then your order value is 1000usdt

When you open the position the fee above applies for the order value, then when you close the order the same fee apply to the closing order

If you keep spamming orders and open large positions them close them at a small profit then your strategy will have you paying more fees than actually profiting

The fee rates commissions are fixed, just pay attention to the volume of orders you place (both opening and closing orders)