Who is the best place to buy or sell coins?

Hello there, I'm curious about the cryptocurrency market and I'm looking to buy or sell some coins. Can you recommend the best place to do so? I've heard of a few exchanges but I'm not sure which one is the most reliable and trustworthy. Is there a particular exchange that stands out in terms of security, fees, and user-friendliness? Or are there other factors that I should consider when choosing a platform for buying and selling coins? Thank you in advance for your insights.