Short Term Capital Gain

I am investing using my savings , no other income source. taking profits less than 2.5lakhs, which typically is a non taxable bracket. is STCG applicable in this case ?

Capital gains are computed independent of other incomes. So yes, STCG/LTCG applies.

If the total annual income, including STCG/LTCG, is less than 2.5L, then you won’t have to pay any tax. I think you will still have to file returns and report your STCG/LTCG in the returns.