Can i ask some advice from trading experts here, How could i trade safely and assure possible profit from my investments?
All trades are at risk. If you want to be safe of course very difficult. The price of all coins can not be stable and price changes can be influenced by anything.
So if you want to be fully secure difficult. Trade to make a profit, so you must be precise in implementing a trading strategy.
Bitcoin and Ethereum may be good coins for trading. These two coins dominate the crypto market. My advice you can do daily trading, but if it has made a profit, better sell direct coins. And you can wait for the price back down to buy coins.