as i am a newbie.. i know nothing about trading... what should i do to start trading and multiply my btc.. guys please help me
Capital is one of important things in trading, if you want a significant profit you should trade altcoin but the risk is quite high so if you don't have skills in trading it will just like trading.
Yes there is no limit for trading. You can start it from any amount. But if you want to see you are in profit or loss you should invest one decent amount. Then only you can able to learn how trading will work. For a newbie, altcoin trading is best to learn. If you want to learn to trade with bitcoins, it will be bit risk, and you need big capital.