What is the best way to invest money with no risk?

There is no such thing as a completely risk-free investment. All investments come with some level of risk, whether it's the risk of losing your principal investment or the risk of not earning a high enough return to keep up with inflation. 

That being said, there are some investment options that are generally considered less risky than others. These include:

High-yield savings accounts: These accounts are FDIC-insured and typically offer a higher interest rate than traditional savings accounts. While there is still some risk of losing purchasing power due to inflation, the risk of losing your principal is minimal.

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2. Certificates of Deposit (CDs): CDs are also FDIC-insured and offer a fixed interest rate for a set period of time. While the returns may not be as high as other investment options, CDs are considered very low risk.
   
   
3. U.S. Treasury Securities: These are bonds issued by the U.S. government and are considered to be very low risk, as the likelihood of the U.S. government defaulting on its debt is extremely low.
   
   
4. Money market funds: These are mutual funds that invest in short-term, low-risk securities such as U.S. Treasury bills and commercial paper. They are considered relatively low risk but do carry some risk, particularly in times of economic instability.
   
   
5. Corporate bonds:  which can come in relatively low-risk varieties (issued by large profitable companies) down to very risky ones. The lowest of the low are known as high-yield bonds or “junk bonds.”
   
   
6. PPF(Public Provident Funds): The Public Provident Fund is also a very popular saving option in India, and it also guarantees returns and tax exemptions. Usually, the tenure for this scheme is 15 years, and it can be extended further if needed.
   
   
   
7. Post Office Schemes: The Post Department of India offers various schemes that can help individuals grow their wealth. It also brings about the habit of saving.

It's important to note that while these investments are generally considered less risky, there is no guarantee of returns and they may not be suitable for everyone's investment goals and risk tolerance. It's always important to do your own research and consult with a financial advisor before making any investment decisions.