I will open accounts on some exchanges soon. I would like to prioritize one where I will be able to practice for free. From what I have read and seen so far, Binance seems to be considered the best exchange overall. However, I didn't see any mention of being able to practice for free on Binance website. So which exchanges would be best for that?
You do not really need an exchange for that, you can do something called paper trading, this is basically the practice of writing your trades and keeping track of them as if you were trading for real, this has the drawback of having to manually calculate commissions and stuff like that but when you are learning I see this as an advantage since it will allow you to familiarize yourself with all aspects of trading and when you finally decide to use real money you will be ready and you will not be surprised by those costs that eat away your capital.