Hi everyone,

I want to start buying some coins (btc, eth, altcoins...) but when looking at the exchanges like bitfinex, bitmex... they all charge some non neglectable fees to deposit USD or coins.
So my question is: is there a way to avoid all these fees ? Is it better to deposit cash on an exchange and buy coins directly on the exchange? Or buy coins and then transfer them to the exchange (I saw bitfinex charges had deposits but not btc deposits for example)

Also if I create an account on different exchanges, do I need to create a wallet for each one or can I use the same wallet on different places ?

Thanks guys