...
Whenever in doubt, check
https://bitcoin.org or in this case
https://bitcoin.org/en/exchanges 
Most may recommend Binance, especially if you also play with altcoins.
I also like Bitstamp, Bittrex and some others, but these will ask for KYC documents.
You should have said if you exchange fiat, Bitcoin, major altcoins, lesser known altcoins...
Edit: about "easy", well, there's a learning curve.. but I am sure you'll find tutorials if you search a little.
Thank you for your reply. I will definitely read your's link. For new users Binance doesn't ask documents for KYC?