To open a free crypto trading account on CoinDCX, simply visit the CoinDCX website or download the mobile app. Click on \"Sign Up\" and enter your email address and mobile number. Next, verify your identity by completing the KYC process using a valid government ID and a selfie. Once verified, you can deposit INR using UPI or bank transfer to start trading. CoinDCX offers a user-friendly interface and access to a wide range of cryptocurrencies, making it ideal for both beginners and experienced traders.