When you are about to deposit fiat or cryptocurrency into your Bybit account you go to your username in the upper right corner. After this, you click “My Assets” and here you will see what cryptocurrencies you can deposit.
Also, if you go to the header menu you will find a button called Buy Crypto (If you are still in “My Assets”). Here you can select what cryptocurrency you want to buy. You can choose among BTC, ETH and USDT.
After this, you can enter what fiat currency you want to pay with and how much fiat currency you want to spend.
Follow the instructions and you will end up on a page telling you what payment options you can choose among. For example, if you want to buy Bitcoin with EUR you can do that with VISA card, Mastercard and SEPA transfer.