Can day trading become a primary income?
It can, but very few succeed. Global statistics show only about 5-10% of day traders are consistently profitable long-term. It requires large capital, high discipline, years of experience, and extremely strong mental fortitude.
What's the difference between day trading and scalping?
Scalping takes very small profits in seconds to minutes with dozens of trades per day. Day trading is more 'relaxed' — positions can be held for hours and profit per trade is larger. Both close positions the same day.