How do I buy DeFi on Binance?

Hello there, I'm curious about purchasing DeFi tokens on the Binance platform. Can you guide me through the process step-by-step? I'm new to this and would like to know if there are any prerequisites or specific instructions I should follow to make sure my purchase goes smoothly. Additionally, are there any fees associated with buying DeFi on Binance, and if so, how do I calculate them? Your help would be greatly appreciated.