Simple, just check their trading activities the more they have liquidity the more you can exchange at ease. Right now there are a lot of exchanges that use bots rather than real people, you will see the difference if an exchange that uses a bot or many real traders if you have some experience in many exchanges. The other thing is the security if an exchange provides a low security then just forget it, it's better to go to the top exchange.
There isn't really "one way" to make sure that you could see if it's bots or real traders. I mean they have improved the bots so much so that we are talking about real looking stuff that gain a lot of volume and that gives people a ton of returns.
If you really want to succeed then you need to make sure that you are looking at the trustable places that we all know. Like for example if you are trading at binance, do you really worry that they would try to trick you into thinking there is a volume there but actually do it with bots? I mean there are bots that trade, but not for volume. Binance wouldn't let it fly, they want legit stuff so they can make a profit.