How to convert glmr to dot?

Could you please explain the steps involved in converting GLMR to DOT? I'm a bit new to cryptocurrency and would like to know the most efficient and secure way to go about it. Do I need to use a specific exchange or wallet? Are there any fees associated with the conversion process? Additionally, is there a way to monitor the real-time exchange rate between GLMR and DOT to ensure I'm getting the best possible deal? Thank you for your help.