Trading is like gambling but can't be regarded as gambling just because it shares certain few features with gambling technicalities in terms of prediction, analysis and odds that be.
Getting into trading it's like trying to learn a skill with a sense of direction unlike gambling that's just mostly based on prediction and luck streaks.
In anything we do in life, nothing is so sure and certain. There is some iota of luck and there is some iota of skills. What differentiate the two is the level or percentage of lucky, compared to percentage of skill. The who that has higher percentage would be called the principal. For example, gambling is 70% luck and 30% skills and we say it is gambling. While trading is 70% skills and 30% luck and we call it trading. They share similar features and both has the ability to make one lose money.