How much money does it cost to start doing bitcoin?

If you have say .001 BTC around 100$. You can use bybit or other leverage exchanges.

You can 10 - 100X leverage your trades. But this also comes with very high risk.

Say if you use .001 (100$) BTC with 10X leverage.

You will be trading with 0.1 (1000$). But if the price of BTC says goes down 10% you get liquidated losing all your money. Yo dont owe any money to exhange nor are you borrowing. Your simply using a leverage.