Yes, you can earn on binary options if you have enough knowledge and practice. Trading is competence and like every competence, it requires training and thought-out actions. Firstly it is better to open a demo account and practice without financial risks. Also, on the demo account trader can understand the principles of work and develop the trading strategy.
Then, the trader builds the trading strategy through trial and error, and through constant education. And only when the trader has enough experience, he may open a professional account. Start with small sums and improve your technique constantly.