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. 
The choice of exchanges depends on an individual, Let say if you are aggressive in trading and want to earn profits in short-term then you should definitely consider Binance exchange with BNB/BTC or BNB/ETH pair for the low trading fees. Trading with Binanace coin on Binance.com provides low trading fees and it will play a major role to get you profits in day trading.