How can I buy dYdX?

Could you please elaborate on the process of purchasing dYdX? I'm interested in adding it to my crypto portfolio but I'm not entirely sure where to start. Is it listed on major exchanges? What are the key steps I need to take to ensure a smooth and secure transaction? Also, are there any specific requirements or limitations I should be aware of before attempting to buy dYdX? Your guidance in this matter would be greatly appreciated.