To invest in NCDs and corporate bonds in India, start by researching different options and assessing their credit ratings. Choose an online platform like Zerodha, Groww, ICICI Direct, HDFC Securities, or Edelweiss, and complete their KYC process to open an account. Browse available bonds, check details such as interest rates and maturity dates, and place your order through the platform. Monitor your investments regularly, considering factors like credit rating, interest rates, maturity periods, and tax implications. These platforms offer user-friendly interfaces and comprehensive support for seamless investment experiences.