I recommend you to pay attention to Allpips. The interface of this platform is pretty intuitive and is not overwhelmed with not-needed tools and excessive information, and it has such cool option called "follow & copy forex traders".

Greetings. I would advise you to start studying this issue from the very beginning and first read about cryptocurrencies and what role exchanges play in this process. As for CEX (Centralized Exchange) and DEX (Decentralized Exchange), these are the two main types of cryptocurrency exchanges that differ in their organization and functionality. I can give you a link to a more informative article https://p2pb2b.com/blog/9-minute-guide-on-choosing-a-crypto-exchange-for-listing/. If something is not clear, then you can find answers to your questions in other blocks. But mostly, focus on the concepts of liquidity, regulation and safety.