How do I exchange Theta to ETH?

Hello there, I'm curious about how to go about exchanging Theta to Ethereum (ETH). Could you walk me through the process step-by-step? I'm not very familiar with cryptocurrency exchanges and would appreciate any guidance you can provide. Are there any specific platforms that you recommend for this type of transaction? Additionally, are there any fees associated with the exchange, and how do I ensure that my funds remain secure throughout the process? Thank you in advance for your help!