I have tried to sell tokens in the past which resulted in losing all that I had, I need more advice on best Exchanges for mostly all altcoins and how safer they are to use?
I use binance,okex and idex(decentralized exchange), binance is pretty much best exchange and top 1 in volume. you should sign up at binance or any other top exchange that you like(research before you sign up!), you can find list of exchanges on coinmarketcap[1].
[1]
https://coinmarketcap.com/exchanges/volume/24-hour/