Most newbies lose huge amount of money because, after learning the basics of trading they feel they know it all, they think they can manipulate through the market. But they end up losing big.
No matter what you are thought, you must know this that to be a successful trader, it takes practice and consistency.
Not enough knowledge or experience in trading might lead to loosing money in trading. Newbies always either come to the trading platform either by hearing news of successful trades from their friends or a good news from medias on crypto's growth and etc. Panic sells, buys and not being patient enough when the market is manipulated. Not choosing the right coins to trade. So likewise there are many reason behind.