Opportunity in GOI 10yrs BONDs

I have bought T-bills through RBI retail direct. It’s very easy to register and buy. G-Secs can be similarly bought. I am buying T-bills because 364 day T-Bill is yielding better returns than bank FDs. And I am not investing from trading point of view. Please appreciate two things about any fixed income security – concept of duration and liquidity. If you are sure about those then and only then think about trading in bond markets.