How do I follow exchange rates?

How do I stay up-to-date with the ever-changing cryptocurrency exchange rates? Are there any reliable sources or tools that I can use to monitor the fluctuations in real-time? Is it important to track multiple currencies or should I focus on just a few? What factors can influence the exchange rates and how can I predict potential changes? Additionally, are there any risks associated with relying solely on automated tools or services for tracking exchange rates?