i have 0,1 bitcoin and i would try to trade. witch platform can i use to trade?
Look if you are willing to do trading and earn from it, I suggest you to do proper research on the capitalization and market trends of different coins that you are interested in before you jump into it. Trading needs some practice so please be careful on what you are trading and dont let every thing you see on the internet influence you.
Now for a platform to trade in there are centralized and decentralized exchanges, and obviously decentralized ones (like EtherDelta) are better than centralized ones. But its totally your decision which ones to use. HitBTC, Poloniex, Bittrex are there where you can trade fiat vs bitcoin/altcoin, bitcoin vs altcoin and altcoin vs altcoin
I use HitBTC and if you want to join with my invite, PM me for a link.