I am new to crypto and I want to learn how to trade but I do not know where to start. Please give me some advice on what are the best exchanges where I could learn how to trade. Your advices will be highly appreciated. 
If I were you, choose the leading ones we have today. I am not using all of them actually. But I believe you will have so many trading choices there and you can also navigate around them pretty easily. Binance and KuCoin are among the top we have right now. I am yet to familiarize myself with these exchanges. I am using, and I can recommend to you as well, Cryptopia and Bittrex. Graviex is a pretty new one which seems great.