Sometimes you can be lured by sweet words and might fall into others trap. As a newbie here you are motivated to try trading for the first time and then decided to buy and sell to earn a little profit. Check on those cheap decentralized exchange and then buy the coin you want to buy and sell, and the suddenly you cant sell it on legitimate exchange. The last thing you know is, its a wrong coin but with the same name but with different contract address.
investing in the world of cryptocurrency does have a very big risk, maybe you can lose all the wealth you have if you choose the wrong way to invest.
therefore in investing you need to look at market conditions first and monitor every coin movement, so that you can invest well. And one more thing do not easily trust the people you just met in the crypto world, moreover the person promises definite benefits and an investment that promises huge profits, because the investment is likely a fraud.