It's quite important to choose the best exchange at the beginning of trading. Most important thing is how a exchange safe for you and which exchange is familiar with your jurisdictions since there is an issue with KYC procedure. On the other hand those exchange have higher volumes you may trade their quite fast due to demand of buy/sell. Most likely you may choose Binance at the beginning, it's quite safe and you may use without KYC although there is withdrawal limits of 2 bitcoin per day. Don't be crazy during trade and don't fall in FOMO. Just learn first with patience.
Also here's my recommendation: Bybit and Phemex i think they're the best ones out there.
Can you please explain briefly how these two exchanges are better? I think they don't have enough reputation till now and volume isn't much higher as well. Before recommendation you should describe some more reasons.