Hi @AnkitSharma331, as Premium Instructor, you can offer your course for a price, at a discount, or for free. It is really your decision to make. As @Salil Dhawan explained, there is no earning when you create a free course. Some instructors choose to launch their courses as free to generate a following, capture reviews, and get feedback, then switch to a paid course at a later date.
Keep in mind, free courses cannot exceed 2 hours in video length and will lose all premium learner features which includes certificate of completion and Q&A. While you can change the price of your course at any time, you can only switch from free to paid one time. Learn more about free courses here.