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.
but i think the amount of money that you are going to invest in trading keep too much important, although you can start trading from any amount of money, but if you a small amount of money then you need to trad a cheep coin because investing a small a amount of money in high price coin is not worth, through this you can only waste your time. while investing in a cheep coin you have chance to make more money depending on the increase of the price of the coin.