thanks for all that Info

is there a platform that works like poloniex?

I really like bitcoin trading, i just depsit and trade, i assume when trading shares it isnt that easy and i think the fees are higher than the 0.15% on polo

but can i do trades like on polo, on exchanges, saying I buy and sell within 30 min??

I talked to a dude in the bank and he said buying shares with less than 5 grand and without keeping them for a while is not really profitable