Are you a beginner? If so, just make sure that you only trade on Spot trading first, don't think about future trading. Oh yeah, where do you live? Because, this will also influence the choice of exchange for you. Because, sometimes, there are some countries that restrict some of the top exchanges, so you have to know which one suits you best and is allowed in your country.

Try checking this coin market cap page:
https://coinmarketcap.com/rankings/exchanges/

There is a large list of exchanges. However, my advice is to choose the ones that are truly top exchanges and can be used in your country. And one more thing, you also have to know whether you want to do KYC or not for the exchange platform. Later you will also learn about the KYC system. So you have to verify your account with your real identity to be able to make transactions or use the exchange. For example, Binance dna checks for other Centralized exchanges (CEX).

However, if you don't want to verify and authorize the data, then you can use a Decentralized exchange, or DEX. This can be more flexible, but the risks may also be greater. Moreover, if you want to make a deposit or withdrawal, you have to put in more effort because you have to use the P2P system to make it easier. Yes, in essence every choice will have its pros and cons.

Binance is number 1 and so far I also use it. The fees are quite reasonable and affordable for transactions. As the number 1 top exchange, of course Binance has various positive sides to choose from. So, of course, try checking the exchnage link that I provided above again, so it's easier to learn.