If you are looking for just a one time investment that will be redeemed in 5 years, then go for a debt fund or a hybrid/balanced – debt oriented fund, depending on your risk appetite.
A quick word of caution – 5 years is too short a time frame to invest for a child’s education (saying this, not knowing the age of the child, and the exact time frame).
You can invest easily online. Visit an online platform like Jama.co.in and open an account – you can start investing in a few minutes.